Fuel / Carburetion System | Tohatsu Nissan Outboard

What This Primer Bulb is Used For

A primer bulb is installed inline in an outboard fuel hose and acts as a manual fuel pump.

Squeezing and releasing the bulb draws fuel from the tank and pushes it toward the engine. Internal one-way check valves help keep fuel moving in the proper direction.

Primer bulbs are commonly used when:

• Starting an outboard after the fuel line has drained
• Priming a newly installed fuel line
• Refilling the line after fuel-system service
• Purging air from the fuel hose
• Replacing an old, hardened or damaged primer bulb

Compatible 5/16" Fuel Hose Options

Pro Marine stocks three common 5/16" fuel-hose options that can be used with this primer bulb. The correct hose depends on the installation and required fuel-hose classification.

MPI 5/16" Type B Fuel Hose - 315-056

5/16" Type B marine fuel hose commonly used in exposed and above-deck applications where Type B hose is appropriate.

Inside Diameter: 5/16"
Sold: By the Foot
Matching Clamp: Oetiker 4-153

View 5/16" Type B Fuel Hose

MPI 5/16" Type A Fuel Hose - 313-1

Type A marine fuel hose for installations requiring the additional Type A fire-resistant classification.

Inside Diameter: 5/16"
Sold: By the Foot
Matching Clamp: Oetiker 4-170

View 5/16" Type A Fuel Hose

Mercury OEM 5/16" Silver Fuel Hose

Genuine Mercury Marine bulk 5/16" fuel hose for compatible Mercury outboard fuel-line applications.

Inside Diameter: 5/16"
Sold: By the Foot
Matching Clamp: Oetiker 4-145

View Mercury OEM Fuel Hose

Correct Clamp for Each 5/16" Fuel Hose

All three hoses have a 5/16" inside diameter, but they do not have the same outside diameter. Different constructions and wall thicknesses require different Oetiker clamp sizes.

Fuel Line Clamps and Installation Tools

Oetiker 4-153 Ear Clamp - 10 Pack

Correct clamp for the MPI 315-056 5/16" Type B fuel hose.

View Oetiker 4-153 Clamp

Oetiker 4-170 Ear Clamp - 10 Pack

Correct clamp for the MPI 313-1 5/16" Type A fuel hose.

View Oetiker 4-170 Clamp

Oetiker 4-145 Ear Clamp - 10 Pack

Correct clamp for the Mercury OEM 5/16" silver fuel hose.

View Oetiker 4-145 Clamp

Oetiker Standard Jaw Pincer Tool

Installation tool for properly closing Oetiker ear clamps when assembling marine fuel-line connections.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool

Assortment of common Oetiker clamp sizes with the installation tool included. A convenient option for marine shops and technicians working with multiple hose sizes.

View Oetiker Clamp Pack

How a Primer Bulb Works

The primer bulb contains internal one-way check valves. When the bulb is squeezed and released, the valves allow fuel to move in one direction through the hose.

Repeatedly squeezing the bulb draws fuel from the fuel tank, fills the fuel line and supplies fuel toward the engine.

Primer Bulb Installation

Install the primer bulb with the fuel-flow arrow pointing toward the engine.

Secure each hose connection using the correct clamp for the specific fuel hose being installed.

When Should a Primer Bulb Be Replaced?

Primer bulbs are continually exposed to fuel, heat and the marine environment and can deteriorate over time.

Inspect or replace the primer bulb if you notice:

• Cracking or visible deterioration
• A bulb that has become excessively hard
• A bulb that stays collapsed
• A bulb that will not become firm when priming
• Fuel leaking around the bulb or hose connections
• Air entering the fuel system
• Internal check-valve problems

Building a Complete 5/16" Outboard Fuel Line

Depending on the installation, a complete 5/16" fuel-line assembly may require:

• Pro Marine 8004 5/16" primer bulb
• 5/16" Type A, Type B or Mercury OEM fuel hose
• Correct tank-side connector or fitting
• Correct engine-side connector or fitting
• Correct Oetiker clamps for the selected hose
• Oetiker pincer installation tool

Type A, Type B or Mercury OEM Fuel Hose?

The Pro Marine 8004 primer bulb fits all three listed hose options because each hose has a 5/16" inside diameter.

The difference is in the hose construction and intended installation.

MPI Type B 315-056 is commonly used in exposed and above-deck applications where Type B hose is permitted.

MPI Type A 313-1 is used where the installation requires the additional Type A fire-resistant classification.

Mercury OEM #100 is the genuine Mercury 5/16" silver fuel-hose option for compatible Mercury fuel-line applications.

Key Features

• Pro Marine 8004 marine fuel primer bulb
• Designed for 5/16" ID fuel hose
• Compatible with MPI 315-056 Type B hose
• Compatible with MPI 313-1 Type A hose
• Compatible with Mercury OEM #100 5/16" silver hose
• Used to manually prime outboard fuel systems
• Helps draw fuel from the tank toward the engine
• Matching Oetiker clamps available for each hose
• Oetiker pincer installation tool available
• Complete Oetiker clamp assortment with tool available

Need Help Building Your Marine Fuel Line?

Hose size, fuel-hose classification, primer bulb size and clamp selection all need to match the fuel-system installation.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size hose does the Pro Marine 8004 primer bulb fit?
The 8004 is designed for 5/16" ID fuel hose.

Can I use this primer bulb with MPI Type B hose?
Yes. It fits the MPI 315-056 5/16" Type B fuel hose .

Can I use it with Type A hose?
Yes. It also fits the MPI 313-1 5/16" Type A fuel hose .

Can I use it with Mercury OEM 5/16" silver fuel hose?
Yes. The Mercury OEM #100 5/16" silver hose also has a 5/16" inside diameter.

Which clamp fits MPI 315-056 Type B hose?
Use the Oetiker 4-153 ear clamp .

Which clamp fits MPI 313-1 Type A hose?
Use the Oetiker 4-170 ear clamp .

Which clamp fits the Mercury OEM 5/16" hose?
Use the Oetiker 4-145 ear clamp .

Why do all three 5/16" hoses use different clamps?
The 5/16" measurement refers to the inside diameter. Each hose has a different construction and outside diameter, so each requires the correct clamp matched to that hose.

Which direction should the primer bulb be installed?
Install it with the fuel-flow arrow pointing toward the engine.

What tool is used to install Oetiker clamps?
Use the Oetiker Standard Jaw Pincer Tool .

Do you sell a clamp assortment?
Yes. The Oetiker Clamp Pack with Tool includes common clamp sizes and the installation tool.

Searchable Part Numbers & Terms

8004, Pro Marine 8004, 5/16 primer bulb, 5/16 marine primer bulb, outboard primer bulb, boat fuel primer bulb, marine fuel bulb, outboard fuel bulb, 5/16 fuel line, 5/16 outboard fuel hose, 315-056, MPI 315-056, 5/16 Type B fuel hose, 313-1, MPI 313-1, 5/16 Type A fuel hose, Mercury fuel hose 100, Mercury 5/16 silver fuel hose, Oetiker 4-153, Oetiker 4-170, Oetiker 4-145, marine fuel line clamp, Oetiker fuel line clamp, primer bulb fuel line, marine fuel system, outboard fuel line

What This Primer Bulb is Used For

A primer bulb is installed inline in an outboard fuel hose and acts as a manual fuel pump.

Squeezing and releasing the bulb draws fuel from the tank and pushes it toward the engine. Internal one-way check valves help keep fuel moving in the proper direction.

Primer bulbs are commonly used when:

• Starting an outboard after the fuel line has drained
• Priming a newly installed fuel-line assembly
• Refilling the line after fuel-system service
• Purging air from the fuel hose
• Replacing an old, hardened or damaged primer bulb

Compatible 3/8" Fuel Hose Options

Pro Marine stocks both Type A and Type B 3/8" marine fuel hose for use with the 8005 primer bulb.

3/8" Type B Marine Fuel Hose - 375

Bulk 3/8" Type B marine fuel hose for exposed and above-deck applications where Type B hose is appropriate.

Inside Diameter: 3/8"
Sold: By the Foot
Matching Clamp: Oetiker 4-185

View 3/8" Type B Fuel Hose

3/8" Type A Marine Fuel Hose - 375-1

Bulk Type A marine fuel hose for installations requiring the additional Type A fire-resistant classification.

Inside Diameter: 3/8"
Sold: By the Foot
Matching Clamp: Oetiker 4-185

View 3/8" Type A Fuel Hose

Correct Clamp for 3/8" Fuel Hose

Both the Type A and Type B 3/8" fuel hoses listed here use the same Oetiker 4-185 ear clamp.

Fuel Line Clamp and Installation Tools

Oetiker 4-185 Ear Clamp - 10 Pack

Matching clamp for both the 375 Type B and 375-1 Type A 3/8" marine fuel hoses.

View Oetiker 4-185 Clamp

Oetiker Standard Jaw Pincer Tool

Installation tool for properly closing Oetiker ear clamps on marine fuel-line connections.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool

Complete assortment of commonly used Oetiker clamp sizes with the installation tool included.

A convenient option for marine shops, technicians and customers servicing multiple fuel-line sizes.

View Oetiker Clamp Pack

How a Primer Bulb Works

The primer bulb contains internal one-way check valves that control the direction of fuel flow.

As the bulb is squeezed and released, it draws fuel from the tank and moves it toward the engine. Repeated squeezes fill the hose and help purge air from the fuel line.

Primer Bulb Installation

Install the primer bulb with the fuel-flow arrow pointing toward the engine.

Secure the hose at the primer bulb and other barbed fittings using the correct Oetiker clamps.

When Should a Primer Bulb Be Replaced?

Fuel, heat, UV exposure and normal use can cause primer bulbs to deteriorate over time.

Inspect or replace the primer bulb if you notice:

• Cracking or visible deterioration
• A bulb that has become excessively hard
• A bulb that stays collapsed after squeezing
• A bulb that will not become firm while priming
• Fuel leakage around the bulb or fittings
• Air entering the fuel system
• Internal check-valve failure

Building a Complete 3/8" Outboard Fuel Line

Depending on the application, a complete 3/8" fuel-line setup may require:

• Pro Marine 8005 3/8" primer bulb
• 375 Type B or 375-1 Type A 3/8" fuel hose
• Correct tank-side fitting or connector
• Correct engine-side fitting or connector
• Oetiker 4-185 ear clamps
• Oetiker pincer installation tool

Type A or Type B Fuel Hose?

The Pro Marine 8005 primer bulb can be used with either listed hose because both use a 3/8" inside diameter.

Type B 375 is commonly used in exposed and above-deck applications where Type B hose is appropriate.

Type A 375-1 is used when the installation requires the additional Type A fire-resistant classification, including many enclosed and below-deck fuel-system applications.

Key Features

• Pro Marine 8005 marine primer bulb
• Designed for 3/8" ID marine fuel hose
• Compatible with 375 Type B fuel hose
• Compatible with 375-1 Type A fuel hose
• Used to manually prime outboard fuel systems
• Helps draw fuel from the tank toward the engine
• Both compatible hoses use Oetiker 4-185 clamps
• Oetiker pincer installation tool available
• Complete Oetiker clamp assortment with tool available

Need Help Building Your Marine Fuel Line?

Choosing the right marine fuel-line setup involves matching hose diameter, Type A or Type B classification, primer bulb size, fittings and the correct clamp.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size hose does the Pro Marine 8005 primer bulb fit?
The 8005 is designed for 3/8" ID fuel hose.

Can I use this primer bulb with Type B fuel hose?
Yes. It fits the 375 3/8" Type B fuel hose .

Can I use this primer bulb with Type A fuel hose?
Yes. It also fits the 375-1 3/8" Type A fuel hose .

Which clamp fits the 3/8" Type B hose?
Use the Oetiker 4-185 ear clamp .

Which clamp fits the 3/8" Type A hose?
The Type A hose also uses the Oetiker 4-185 ear clamp .

Do Type A and Type B 3/8" hose use the same clamp?
Yes. Both 3/8" hose options listed here use the Oetiker 4-185 clamp.

Which direction should the primer bulb be installed?
Install the primer bulb with the fuel-flow arrow pointing toward the engine.

What tool installs the Oetiker clamp?
Use the Oetiker Standard Jaw Pincer Tool .

Do you sell a clamp assortment?
Yes. The Oetiker Clamp Pack with Tool includes common clamp sizes and the installation tool.

Searchable Part Numbers & Terms

8005, Pro Marine 8005, 3/8 primer bulb, 3/8 marine primer bulb, outboard primer bulb, boat fuel primer bulb, marine fuel bulb, outboard fuel bulb, 3/8 fuel line, 3/8 outboard fuel hose, 375, 3/8 Type B fuel hose, 375-1, 3/8 Type A fuel hose, Oetiker 4-185, 4-185 fuel hose clamp, marine fuel line clamp, Oetiker fuel line clamp, primer bulb fuel line, marine fuel system, outboard fuel line, boat fuel line

What This Primer Bulb is Used For

A primer bulb is installed inline in an outboard fuel hose and acts as a manual fuel pump.

Squeezing the bulb draws fuel from the fuel tank and pushes it toward the engine. Internal check valves help direct fuel flow in the correct direction.

Primer bulbs are commonly used when:

• Starting an outboard after the fuel line has drained
• Priming a new fuel-line installation
• Refilling the line after fuel-system service
• Purging air from the fuel line
• Replacing an old, hardened or damaged primer bulb

Compatible Fuel Hose

Pro Marine stocks both Type A and Type B 1/4" marine fuel hose for use with this primer bulb.

MPI 1/4" Type B Marine Fuel Hose - 315-014

Bulk 1/4" marine fuel hose for exposed and above-deck applications where Type B hose is appropriate.

Inside Diameter: 1/4"
Sold: By the Foot
Matching Clamp: Oetiker 4-133

View 1/4" Type B Fuel Hose

MPI 1/4" Type A Marine Fuel Hose - 314-1

Bulk Type A marine fuel hose for installations requiring the additional Type A fire-resistant classification.

Inside Diameter: 1/4"
Sold: By the Foot
Matching Clamp: Oetiker 4-170

View 1/4" Type A Fuel Hose

Correct Clamp for Each 1/4" Fuel Hose

Both hoses use a 1/4" inside diameter, but their outside diameters are different because of their construction and wall thickness. This means they require different Oetiker clamps.

Fuel Line Clamps and Installation Tools

Oetiker 4-133 Ear Clamp - 10 Pack

Correct clamp for the MPI 315-014 1/4" Type B fuel hose.

View Oetiker 4-133 Clamp

Oetiker 4-170 Ear Clamp - 10 Pack

Correct clamp for the MPI 314-1 1/4" Type A fuel hose.

View Oetiker 4-170 Clamp

Oetiker Standard Jaw Pincer Tool

Installation tool for properly closing Oetiker ear clamps when assembling marine fuel-line connections.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool

A complete assortment of commonly used Oetiker clamp sizes with the installation tool included.

A convenient option for marine shops, technicians or anyone servicing multiple fuel-hose sizes.

View Oetiker Clamp Pack

How a Primer Bulb Works

The primer bulb contains internal one-way check valves. When the bulb is squeezed and released, these valves allow fuel to move in one direction through the fuel line.

Repeatedly squeezing the bulb draws fuel from the tank, fills the line and supplies fuel toward the engine.

Primer Bulb Installation

Install the primer bulb with the fuel-flow arrow pointing toward the engine.

A typical fuel path is:

Secure each hose connection using the clamp matched to the specific fuel hose being installed.

When Should a Primer Bulb Be Replaced?

Primer bulbs are exposed to fuel, heat and the marine environment and can deteriorate over time.

Inspect or replace the primer bulb if you notice:

• Cracking or surface deterioration
• A bulb that has become excessively hard
• A bulb that stays collapsed
• A bulb that will not become firm when priming
• Fuel leakage around the bulb or fittings
• Air entering the fuel line
• Internal check-valve problems

Building a Complete 1/4" Outboard Fuel Line

Depending on your installation, a complete 1/4" fuel-line assembly may require:

• Pro Marine 8002 1/4" primer bulb
• 1/4" Type A or Type B marine fuel hose
• Correct engine-side connector or fitting
• Correct tank-side connector or fitting
• Correct Oetiker clamps for the selected hose
• Oetiker pincer tool

Type A or Type B Fuel Hose?

The primer bulb works with either of the 1/4" hose options because both have the same 1/4" inside diameter.

The correct hose classification depends on the fuel-system installation.

Type B is commonly used in exposed and above-deck installations where Type B hose is permitted.

Type A is used where the installation requires the additional Type A fire-resistant classification, including many enclosed and below-deck fuel-system applications.

Key Features

• Pro Marine 8002 marine primer bulb
• Designed for 1/4" ID marine fuel hose
• Compatible with MPI 315-014 Type B fuel hose
• Compatible with MPI 314-1 Type A fuel hose
• Used to manually prime outboard fuel systems
• Helps draw fuel from the tank toward the engine
• Type B Oetiker 4-133 clamps available
• Type A Oetiker 4-170 clamps available
• Oetiker installation pincer available
• Complete Oetiker clamp assortment with tool available

Need Help Building Your Marine Fuel Line?

Hose size, Type A or Type B classification, primer bulb size and clamp selection all need to match the fuel-system installation.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size hose does the Pro Marine 8002 primer bulb fit?
The 8002 is designed for 1/4" ID fuel hose.

Can I use this primer bulb with Type A fuel hose?
Yes. It can be used with the MPI 314-1 1/4" Type A hose .

Can I use it with Type B fuel hose?
Yes. It also fits the MPI 315-014 1/4" Type B hose .

Which clamp fits the 1/4" Type B hose?
Use the Oetiker 4-133 ear clamp .

Which clamp fits the 1/4" Type A hose?
Use the Oetiker 4-170 ear clamp .

Why do the Type A and Type B hoses use different clamps?
Both hoses have a 1/4" inside diameter, but their outside diameters differ because of their construction and wall thickness. Clamp size must match the outside diameter of the specific hose.

Which direction should the primer bulb be installed?
Install the primer bulb with the fuel-flow arrow pointing toward the engine.

What tool is used to install Oetiker clamps?
Use the Oetiker Standard Jaw Pincer Tool .

Do you sell a clamp assortment?
Yes. The Oetiker Clamp Pack with Tool includes common clamp sizes and an installation tool.

Searchable Part Numbers & Terms

8002, Pro Marine 8002, 1/4 primer bulb, 1/4 marine primer bulb, outboard primer bulb, boat fuel primer bulb, marine fuel bulb, outboard fuel bulb, 1/4 fuel line, 1/4 outboard fuel hose, 315-014, MPI 315-014, 1/4 Type B fuel hose, 314-1, MPI 314-1, 1/4 Type A fuel hose, Oetiker 4-133, Oetiker 4-170, marine fuel line clamp, Oetiker fuel line clamp, primer bulb fuel line, marine fuel system, outboard fuel line

What This Tygon Bleed Hose is Used For

Item 259 is intended for small-diameter marine applications requiring 1/8" transparent Tygon bleed hose.

Small bleed lines can become brittle, cracked, loose or damaged over time. Replacing deteriorated tubing helps maintain proper fluid routing and system operation.

Always verify the required inside diameter and application before replacing an existing hose.

Why Use Transparent Bleed Hose?

Transparent hose allows the line and the fluid inside it to be visually inspected during service.

Depending on the system, this can make it easier to identify:

• Whether fluid is present in the line
• Air pockets
• Visible contamination
• Flow interruptions
• Hose discoloration or deterioration

Tygon Hose Size Guide

Other Tygon Hose Options

3/32" Tygon Hose - 255

Transparent small-diameter Tygon hose for oil-injection applications.

View 3/32" Tygon Hose

3/16" Tygon Fuel Hose - 256

Transparent 3/16" Tygon fuel line for compatible PWC fuel-system applications.

View 3/16" Tygon Fuel Hose

1/4" Tygon Fuel Hose - 257

Transparent 1/4" Tygon fuel hose for compatible PWC and MerCruiser pump-to-carb applications.

View 1/4" Tygon Fuel Hose

5/16" Tygon Fuel Hose - 258

Transparent 5/16" Tygon fuel hose for compatible PWC and outboard fuel-system applications.

View 5/16" Tygon Fuel Hose

Fuel Line Clamp Tools

Pro Marine also stocks Oetiker clamp tools and a complete clamp assortment for marine hose applications that use Oetiker ear clamps.

Oetiker Standard Jaw Pincer - 14118CJ

Standard-jaw pincer tool for properly closing compatible Oetiker ear clamps used on marine hose connections.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool - CLAMP-PACK

Complete assortment of commonly used Oetiker clamp sizes with the installation tool included.

View Oetiker Clamp Pack

Choosing the Correct Bleed Hose Size

Bleed hose should be matched to the exact fitting and fluid-line application. Item 259 has a 1/8" inside diameter.

Do not substitute another hose size simply because it appears close. A proper fit at each connection is important for preventing leaks and maintaining reliable fluid flow.

When Should Bleed Hose Be Replaced?

Small-diameter hose should be inspected during normal system service. Replacement should be considered if the hose shows:

• Cracking or splitting
• Hardening or brittleness
• Fluid leakage
• Loose connections at fittings
• Visible contamination or deterioration
• Abrasion or routing damage

Key Features and Benefits

• 1/8" inside diameter
• 10-foot length
• Transparent Tygon bleed hose
• Suitable for compatible marine and PWC bleed-line applications
• Transparent construction allows visual inspection of fluid in the line
• Additional Tygon fuel-hose sizes available
• Small oil-injection hose option available
• Oetiker pincer tool available for compatible clamp applications
• Complete Oetiker clamp assortment with tool available

Need Help Choosing the Right Hose?

Hose diameter, hose construction, application and clamp selection should all match the system being serviced.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is Pro Marine item 259?
Item 259 is 1/8" ID Tygon bleed hose.

How much hose is included?
Item 259 is supplied in a 10-foot length.

Is this hose transparent?
Yes. The transparent construction allows visual inspection of fluid inside the hose.

Is this a main fuel-supply hose?
No. Item 259 is listed as a bleed hose, not as the larger main fuel-feed hose used between a tank and engine.

Is this sold by the foot?
No. Item 259 is supplied as a 10-foot length.

Do you carry 3/32" Tygon hose?
Yes. Pro Marine stocks item 255 3/32" Tygon hose .

Do you carry larger Tygon fuel hose?
Yes. Pro Marine stocks 3/16", 1/4" and 5/16" Tygon fuel hose.

Do you sell an Oetiker clamp installation tool?
Yes. The Oetiker 14118CJ Standard Jaw Pincer is available for compatible ear-clamp applications.

Do you sell a clamp assortment?
Yes. The Pro Marine Oetiker Clamp Pack with Tool includes commonly used clamp sizes and the installation tool.

Searchable Part Numbers and Terms

259, Tygon 259, 1/8 Tygon hose, 1/8 bleed hose, Tygon bleed hose, marine bleed hose, PWC bleed hose, small fluid hose, transparent bleed line, transparent Tygon tubing, oil bleed hose, marine bleed line, 255, 3/32 Tygon hose, 256, 3/16 Tygon fuel hose, 257, 1/4 Tygon fuel hose, 258, 5/16 Tygon fuel hose

Compatible Applications

Item 258 is intended for fuel-system applications requiring 5/16" transparent Tygon fuel hose.

• PWC fuel systems requiring 5/16" ID hose
• Outboard fuel-system applications requiring 5/16" ID hose
• Other compatible small fuel circuits requiring this hose size and material

Always verify the required inside diameter and hose application before replacing an existing fuel line.

Why Use Transparent Tygon Fuel Hose?

Transparent hose makes it easier to visually inspect what is happening inside the fuel line.

Depending on the system, this can help identify:

• Whether fuel is present in the line
• Obvious air pockets
• Fuel-flow interruptions
• Visible contamination
• Hose discoloration or deterioration

Tygon Hose Size Guide

Other Tygon Hose Options

3/32" Tygon Hose - 255

Transparent small-diameter Tygon hose for PWC oil-injection applications. Supplied in a 10-foot length.

View 3/32" Tygon Hose

3/16" Tygon Fuel Hose - 256

Transparent 3/16" Tygon fuel line for compatible PWC fuel-system applications.

View 3/16" Tygon Fuel Hose

1/4" Tygon Fuel Hose - 257

Transparent 1/4" Tygon fuel hose for compatible PWC and MerCruiser pump-to-carburetor applications.

View 1/4" Tygon Fuel Hose

1/8" Tygon Bleed Hose - 259

Transparent 1/8" Tygon bleed hose supplied in a 10-foot length.

View 1/8" Tygon Bleed Hose

Fuel Line Clamp Tools

Pro Marine also stocks Oetiker clamp tools and a complete clamp assortment for marine hose applications that use Oetiker ear clamps.

Oetiker Standard Jaw Pincer - 14118CJ

Standard-jaw pincer tool for properly closing compatible Oetiker ear clamps used on marine hose connections.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool - CLAMP-PACK

Complete assortment of commonly used Oetiker clamp sizes with the installation tool included. Ideal for marine technicians servicing multiple hose sizes.

View Oetiker Clamp Pack

Choosing the Correct Tygon Hose Size

Tygon hose should be matched to the fitting and fuel-system application. Item 258 has a 5/16" inside diameter.

Verify the original hose size before installation. Do not substitute 1/4", 3/16" or another hose diameter simply because the connection appears similar.

When Should Tygon Fuel Hose Be Replaced?

Inspect fuel hose during routine fuel-system service and replace it when deterioration is found.

Common reasons for replacement include:

• Cracks or splits
• Hardening or brittleness
• Fuel leakage
• Loose connections at fittings
• Severe discoloration or deterioration
• Abrasion or routing damage

Key Features and Benefits

• 5/16" inside diameter
• 10-foot length
• Transparent Tygon fuel hose
• Useful for compatible PWC fuel-system applications
• Useful for compatible outboard fuel-system applications
• Transparent construction allows visual inspection of the fuel line
• Additional Tygon fuel-hose sizes available
• Oil-injection and bleed-hose options available
• Oetiker pincer tool available for compatible clamp applications
• Complete Oetiker clamp assortment with tool available

Need Help Choosing the Right Fuel Hose?

Hose diameter, hose construction, application and clamp selection all need to match the system being serviced.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is Pro Marine item 258?
Item 258 is 5/16" ID Tygon fuel hose.

How much hose is included?
Item 258 is supplied in a 10-foot length.

Is this hose transparent?
Yes. The transparent construction allows visual inspection of fuel inside the line.

Does this hose fit PWC applications?
Yes. Item 258 is used in compatible PWC fuel systems requiring 5/16" Tygon hose.

Can this hose be used in outboard fuel systems?
Yes. It is also suitable for compatible outboard applications requiring 5/16" Tygon fuel hose.

Is this hose sold by the foot?
No. Item 258 is supplied as a 10-foot length.

Do you carry smaller Tygon fuel hose?
Yes. Pro Marine stocks 3/16" Tygon fuel hose and 1/4" Tygon fuel hose .

Do you carry oil-injection hose?
Yes. Pro Marine stocks item 255 3/32" Tygon hose for small oil-injection line applications.

Do you carry Tygon bleed hose?
Yes. Pro Marine stocks item 259 1/8" Tygon bleed hose .

Do you sell an Oetiker clamp installation tool?
Yes. The Oetiker 14118CJ Standard Jaw Pincer is available for compatible Oetiker ear-clamp applications.

Do you sell a complete clamp assortment?
Yes. The Pro Marine Oetiker Clamp Pack with Tool includes common clamp sizes and the installation tool.

Searchable Part Numbers and Terms

258, Tygon 258, 5/16 Tygon hose, 5/16 Tygon fuel hose, 5/16 fuel line, PWC fuel hose, PWC fuel line, outboard fuel hose, outboard fuel line, transparent fuel hose, transparent fuel line, Tygon fuel hose, Tygon hose 10ft, marine fuel hose, 255, 3/32 Tygon hose, 256, 3/16 Tygon fuel hose, 257, 1/4 Tygon fuel hose, 259, 1/8 Tygon bleed hose

Compatible Applications

Item 257 is intended for fuel-system applications requiring 1/4" transparent Tygon fuel hose.

• PWC fuel-line applications requiring 1/4" ID hose
• MerCruiser fuel-pump-to-carburetor hose applications requiring 1/4" ID line
• Other compatible small fuel-system circuits requiring this hose size and material

Always verify the required hose size and application before replacing an existing fuel line.

MerCruiser Pump-to-Carb Fuel Hose

Item 257 is also useful for compatible MerCruiser pump-to-carburetor fuel-line applications requiring 1/4" hose.

This section of the fuel system carries fuel from the fuel pump toward the carburetor. Verify the original hose diameter and fuel-system configuration before installation.

Why Use Transparent Tygon Fuel Hose?

Transparent fuel hose makes it possible to visually inspect the fuel inside the line during service.

Depending on the application, this can help identify:

• Whether fuel is present in the line
• Obvious air pockets
• Fuel-flow interruptions
• Visible contamination
• Line deterioration or discoloration

Tygon Hose Size Guide

Other Tygon Hose Options

3/32" Tygon Hose - 255

Transparent small-diameter Tygon hose for PWC oil-injection applications. Supplied in a 10-foot length.

View 3/32" Tygon Hose

3/16" Tygon Fuel Hose - 256

Transparent 3/16" Tygon fuel line for compatible PWC fuel-system applications.

View 3/16" Tygon Fuel Hose

5/16" Tygon Fuel Hose - 258

Transparent 5/16" Tygon fuel hose for compatible PWC and outboard fuel-system applications.

View 5/16" Tygon Fuel Hose

1/8" Tygon Bleed Hose - 259

Transparent 1/8" Tygon bleed hose supplied in a 10-foot length.

View 1/8" Tygon Bleed Hose

Fuel Line Clamp Tools

Pro Marine also stocks Oetiker clamp installation tools and a complete clamp assortment for marine fuel-line applications that use Oetiker ear clamps.

Oetiker Standard Jaw Pincer - 14118CJ

Standard-jaw pincer tool for properly closing compatible Oetiker ear clamps used on marine hose connections.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool - CLAMP-PACK

Complete assortment of commonly used Oetiker clamp sizes with the installation tool included. Ideal for marine technicians servicing multiple hose sizes.

View Oetiker Clamp Pack

Choosing the Correct Tygon Hose Size

Tygon hose should be matched to the fitting and fuel-system application. Item 257 has a 1/4" inside diameter.

Do not substitute a 3/16" or 5/16" hose simply because the fitting appears close in size. The hose must fit the fuel-system connection properly and match the original application.

When Should Tygon Fuel Hose Be Replaced?

Inspect small fuel lines during normal fuel-system maintenance. Replace hose that shows signs such as:

• Cracks or splitting
• Hardening or brittleness
• Fuel leakage
• Loose hose-to-fitting connections
• Severe discoloration or deterioration
• Abrasion or routing damage

Key Features and Benefits

• 1/4" inside diameter
• 10-foot length
• Transparent Tygon fuel hose
• Fits compatible PWC fuel-system applications
• Fits compatible MerCruiser pump-to-carburetor applications
• Transparent construction allows visual inspection of fuel flow
• Additional Tygon fuel-hose sizes available
• Oil-injection and bleed-hose options also available
• Oetiker pincer tool available for compatible clamp applications
• Complete Oetiker clamp assortment with tool available

Need Help Choosing the Right Fuel Hose?

Hose diameter, hose construction, application and clamp selection all matter when servicing marine fuel systems.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is Pro Marine item 257?
Item 257 is 1/4" ID Tygon fuel hose.

How much hose is included?
The hose is supplied in a 10-foot length.

Is this hose transparent?
Yes. Its transparent construction allows visual inspection of fuel inside the hose.

Does this hose fit PWC applications?
Yes. Item 257 is used in compatible PWC fuel systems requiring 1/4" Tygon hose.

Can this be used on MerCruiser engines?
Yes. Item 257 is listed for compatible MerCruiser fuel-pump-to-carburetor applications requiring 1/4" hose.

Is this sold by the foot?
No. Item 257 is supplied as a 10-foot length.

Do you carry a smaller Tygon fuel hose?
Yes. Pro Marine stocks 3/16" Tygon fuel hose .

Do you carry a larger Tygon fuel hose?
Yes. Pro Marine stocks 5/16" Tygon fuel hose .

Do you sell oil-injection and bleed hose?
Yes. Pro Marine also stocks 3/32" Tygon oil-injection hose and 1/8" Tygon bleed hose .

Do you sell Oetiker clamp tools?
Yes. The Oetiker 14118CJ Standard Jaw Pincer is available for compatible Oetiker ear-clamp installations.

Do you sell a complete clamp assortment?
Yes. The Pro Marine Oetiker Clamp Pack with Tool includes common clamp sizes and the installation tool.

Searchable Part Numbers and Terms

257, Tygon 257, 1/4 Tygon hose, 1/4 Tygon fuel hose, 1/4 fuel line, PWC fuel hose, PWC fuel line, MerCruiser fuel hose, MerCruiser pump to carb hose, pump to carb fuel line, carburetor fuel hose, transparent fuel hose, transparent fuel line, Tygon fuel hose 10ft, 255, 3/32 Tygon hose, 256, 3/16 Tygon fuel hose, 258, 5/16 Tygon fuel hose, 259, 1/8 Tygon bleed hose

What This Tygon Fuel Hose is Used For

Item 256 is used for small-diameter fuel-line applications requiring 3/16" Tygon fuel hose. It is particularly useful when servicing PWC fuel systems that use this hose diameter.

Fuel hose can deteriorate with age and exposure to fuel, heat and the operating environment. Hose that has become hard, brittle, cracked, damaged or otherwise deteriorated should be inspected and replaced as needed.

Always verify the required inside diameter and application before replacing an existing fuel hose.

Benefits of Transparent Tygon Fuel Hose

One of the useful characteristics of transparent Tygon hose is the ability to visually inspect the fuel inside the line.

Depending on the system, this can help during fuel-system diagnosis and service by making it easier to identify whether fuel is present in the line and spot obvious air pockets or contamination.

Tygon Hose Size Guide

Other Tygon Hose Options

3/32" Tygon Hose - 255

Transparent small-diameter Tygon hose for PWC oil-injection line applications. Supplied in a 10-foot length.

View 3/32" Tygon Hose

1/4" Tygon Fuel Hose - 257

Transparent 1/4" Tygon fuel hose supplied in a 10-foot length.

View 1/4" Tygon Fuel Hose

5/16" Tygon Fuel Hose - 258

Transparent 5/16" Tygon fuel hose supplied in a 10-foot length.

View 5/16" Tygon Fuel Hose

1/8" Tygon Bleed Hose - 259

Transparent 1/8" Tygon bleed hose supplied in a 10-foot length.

View 1/8" Tygon Bleed Hose

Fuel Line Clamp Tools

Pro Marine also stocks Oetiker installation tools and a complete clamp assortment for marine fuel-line applications that use Oetiker ear clamps. Always match the clamp to the specific hose and fitting being serviced.

Oetiker Standard Jaw Pincer - 14118CJ

Standard-jaw pincer tool for properly closing compatible Oetiker ear clamps used on marine hose connections.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool - CLAMP-PACK

Complete Pro Marine Oetiker clamp assortment with the installation tool included. A convenient option for shops and technicians working with multiple marine hose sizes.

View Oetiker Clamp Pack

Choosing the Correct Tygon Hose Size

Tygon hose should be matched to the inside diameter required by the fitting and fuel system. Item 256 has a 3/16" inside diameter.

When replacing existing hose, verify the original hose diameter and the application before installation. Do not substitute another diameter simply because it appears close in size.

When Should Tygon Fuel Hose Be Replaced?

Inspect small fuel lines as part of normal fuel-system service. Replacement should be considered if the hose shows:

• Cracks or splits
• Hardening or brittleness
• Visible deterioration
• Fuel leakage
• Loose connections at fittings
• Damage from abrasion or improper routing

Key Features and Benefits

• 3/16" inside diameter
• 10-foot length
• Transparent Tygon fuel hose
• Useful for PWC fuel-line applications requiring 3/16" hose
• Transparent construction allows visual inspection of the fuel line
• Multiple additional Tygon hose sizes available
• Oil-injection and bleed-hose options available
• Oetiker pincer tool available for compatible clamp applications
• Complete Oetiker clamp pack with tool available

Need Help Choosing the Right Fuel Hose?

Fuel-line diameter, hose type, fittings and clamp selection all need to match the application. Use the Pro Marine Fuel Line Technical Center to compare the different fuel-hose options and related installation parts.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is Pro Marine item 256?
Item 256 is 3/16" ID Tygon fuel hose.

How much hose is included?
Item 256 is supplied in a 10-foot length.

Is this hose transparent?
Yes. The transparent construction allows visual inspection of the fuel line during service.

Is this hose sold by the foot?
No. Item 256 is supplied as a 10-foot length.

Do you have a smaller Tygon hose?
Yes. Pro Marine stocks item 255 3/32" Tygon hose for small oil-injection line applications.

Do you carry larger Tygon fuel hose?
Yes. Pro Marine also stocks 1/4" Tygon fuel hose and 5/16" Tygon fuel hose .

Do you carry Tygon bleed hose?
Yes. Pro Marine stocks item 259 1/8" Tygon bleed hose .

Do you sell an Oetiker clamp installation tool?
Yes. The Oetiker 14118CJ Standard Jaw Pincer is available for compatible Oetiker ear-clamp applications.

Do you sell a clamp assortment?
Yes. The Pro Marine CLAMP-PACK includes an assortment of Oetiker clamps and the installation tool.

Searchable Part Numbers and Terms

256, Tygon 256, 3/16 Tygon hose, 3/16 fuel hose, 3/16 fuel line, PWC fuel hose, PWC fuel line, Tygon fuel hose, transparent fuel hose, transparent fuel line, Tygon tubing, Tygon hose 10ft, small fuel hose, PWC fuel system, 255, 3/32 Tygon hose, 257, 1/4 Tygon fuel hose, 258, 5/16 Tygon fuel hose, 259, 1/8 Tygon bleed hose

What This Tygon Hose is Used For

Item 255 is intended for small-diameter fluid-line applications requiring 3/32" Tygon tubing. Pro Marine lists this hose primarily for PWC small oil-injection line applications.

Small oil-injection hoses can become hard, brittle, cracked or damaged with age. Replacing deteriorated tubing is an important part of servicing an oil-injected PWC or other compatible system.

Always verify the required inside diameter and application before replacing an existing hose.

Why Use Transparent Tygon Hose?

Transparent tubing provides an important advantage on small fluid lines: it allows the technician to visually inspect what is happening inside the hose.

Depending on the system, this can make it easier to check for fluid in the line and identify obvious air pockets or contamination during service.

Tygon Hose Size Guide

Other Tygon Hose Options

3/16" Tygon Fuel Hose - 256

Transparent 3/16" Tygon fuel hose for PWC applications. Supplied in a 10-foot length.

View 3/16" Tygon Hose

1/4" Tygon Fuel Hose - 257

Transparent 1/4" Tygon fuel hose for PWC and listed MerCruiser pump-to-carb applications.

View 1/4" Tygon Hose

5/16" Tygon Fuel Hose - 258

Transparent 5/16" Tygon fuel hose for PWC and outboard applications. Supplied in a 10-foot length.

View 5/16" Tygon Hose

1/8" Tygon Bleed Hose - 259

Universal transparent 1/8" Tygon bleed hose supplied in a 10-foot length.

View 1/8" Tygon Bleed Hose

Fuel Line Clamp Tools

When servicing marine fuel, oil-injection and bleed-line systems, Pro Marine also stocks Oetiker clamp tools and a complete clamp assortment for applications that use Oetiker ear clamps.

Oetiker Standard Jaw Pincer - 14118CJ

Standard-jaw pincer tool for properly closing compatible Oetiker ear clamps used on marine hose connections.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool - CLAMP-PACK

Pro Marine clamp assortment containing 130 pieces plus the installation tool. A convenient option for marine shops and technicians servicing multiple hose sizes.

View Oetiker Clamp Pack

Choosing the Correct Tygon Hose Size

Hose size should be matched to the fitting and system being serviced. Do not substitute a larger or smaller hose simply because it appears close in size.

For an existing oil-injection, fuel or bleed-line system, compare the original hose size and application before replacement. If the application is uncertain, verify the engine or PWC model and the required hose size before installation.

Key Features and Benefits

• 3/32" inside diameter Tygon tubing
• 10-foot length
• Transparent construction
• Designed for small oil-injection line applications
• Commonly used in PWC service applications
• Allows visual inspection of fluid inside the hose
• Additional Tygon sizes available from 3/16" through 5/16"
• 1/8" Tygon bleed hose also available
• Oetiker pincer tool available for compatible ear-clamp applications
• Complete Pro Marine Oetiker clamp pack and tool available

Need Help Choosing the Right Hose?

Hose diameter and application both matter when replacing marine fuel, oil-injection and bleed lines. Pro Marine's Fuel Line Technical Center brings together our hose sizes, fuel-line classifications, clamps and related installation information.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is Pro Marine item 255?
Item 255 is 3/32" ID Tygon hose supplied in a 10-foot length.

What is 3/32" Tygon hose used for?
Pro Marine lists item 255 primarily for PWC small oil-injection line applications.

Is the hose transparent?
Yes. Item 255 is transparent, allowing the line and fluid inside it to be visually inspected.

Is this hose sold by the foot?
No. Item 255 is supplied as a 10-foot length.

Do you carry larger Tygon fuel hose?
Yes. Pro Marine stocks 3/16", 1/4" and 5/16" transparent Tygon fuel hose.

Do you carry Tygon bleed hose?
Yes. Pro Marine stocks item 259 1/8" Tygon bleed hose in a 10-foot length.

Do you sell an Oetiker clamp installation tool?
Yes. The Oetiker 14118CJ Standard Jaw Pincer is available for compatible Oetiker ear-clamp applications.

Do you sell a complete Oetiker clamp assortment?
Yes. The Pro Marine CLAMP-PACK contains 130 pieces plus the installation tool.

Searchable Part Numbers & Terms

255, Tygon 255, 3/32 Tygon hose, 3/32 oil injection hose, 3/32 oil line, PWC oil injection hose, PWC oil line, small oil injection line, transparent Tygon tubing, transparent oil hose, Tygon hose 10ft, Tygon tubing, 256, 3/16 Tygon fuel hose, 257, 1/4 Tygon fuel hose, 258, 5/16 Tygon fuel hose, 259, 1/8 Tygon bleed hose