How to Order Bulk Fuel Hose

This fuel hose is sold by the foot. Enter the quantity based on the continuous hose length required for your installation.

For example, if your fuel-line run requires 6 feet of hose, order a quantity of 6.

Type B Marine Fuel Hose

Marine fuel hose classifications identify how the hose is intended to be used within a boat's fuel system.

Type B fuel hose is commonly used for exposed or above-deck applications where that hose classification is appropriate. It does not carry the same additional fire-test classification as Type A marine fuel hose.

If your fuel line passes through an enclosed area or the installation specifically requires Type A hose, use the Type A option linked below.

Complete Your 1/4" Fuel Line Setup

Build a complete 1/4" outboard fuel-line setup with the matching clamp, primer bulb and installation tools shown below.

Oetiker 4-133 Ear Clamp - 10 Pack

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

Clamp Size: 4-133

View Oetiker 4-133 Clamp

Pro Marine 8002 - 1/4" Primer Bulb

Matching 1/4" primer bulb for building or repairing marine outboard fuel-line assemblies using 1/4" hose.

Hose Size: 1/4"

View 1/4" Primer Bulb

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

View Oetiker Clamp Pack

1/4" Type A Alternative

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

Use the Type A version when the installation requires the additional Type A fire-resistant marine fuel-hose classification.

Inside Diameter: 1/4"
Fuel Hose Type: Type A
Matching Clamp: Oetiker 4-170

View 1/4" Type A Fuel Hose

1/4" Fuel Hose Comparison

Why Do Two 1/4" Hoses Use Different Clamps?

The 1/4" measurement refers to the hose's inside diameter. It does not determine the outside diameter of the hose.

Type A and Type B hose use different constructions and wall thicknesses, so their outside diameters can be different even when both have a 1/4" inside diameter.

That is why the MPI 315-014 Type B hose uses Oetiker 4-133, while the MPI 314-1 Type A hose uses Oetiker 4-170.

What This Fuel Hose is Used For

MPI 315-014 1/4" Type B fuel hose can be used for building, replacing or repairing marine fuel lines where 1/4" hose and a Type B classification are appropriate.

Because this hose is sold in bulk by the foot, it can be paired with the correct primer bulb, fittings and clamps to create a custom-length fuel-line assembly.

Building a 1/4" Outboard Fuel Line

A typical 1/4" outboard fuel-line assembly may require:

• MPI 315-014 1/4" Type B marine fuel hose
• Pro Marine 8002 1/4" primer bulb
• Correct tank-side fitting or connection
• Correct engine-side fitting or connector
• Oetiker 4-133 ear clamps
• Oetiker pincer installation tool

The exact components required depend on the engine, fuel tank and overall fuel-system layout.

Primer Bulb Selection

Primer bulb fittings should match the inside diameter of the fuel hose. For this 1/4" hose, use the Pro Marine 8002 1/4" Primer Bulb.

View Pro Marine 8002 1/4" Primer Bulb

Key Features & Benefits

• 1/4" inside diameter
• MPI Products marine fuel hose
• Type B marine fuel-hose construction
• Commonly used in exposed and above-deck applications where Type B hose is permitted
• Sold by the foot for custom-length installations
• Matching Oetiker 4-133 clamp available
• Matching Pro Marine 8002 1/4" primer bulb available
• Type A 1/4" alternative available
• Oetiker installation tool available
• Complete Oetiker clamp assortment with tool available

Need Help Choosing the Right Marine Fuel Hose?

Choosing the correct marine fuel line depends on hose diameter, installation location, fuel-hose classification, fittings, primer bulb size and clamp size.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is MPI 315-014?
It has a 1/4" inside diameter.

Is this hose sold by the foot?
Yes. Order the quantity corresponding to the total number of feet required.

What type of marine fuel hose is this?
This is MPI Type B marine fuel hose.

Where is Type B fuel hose commonly used?
Type B hose is commonly used for exposed and above-deck fuel-line applications where that classification is permitted.

Which clamp fits MPI 315-014?
Use the Oetiker 4-133 ear clamp .

Which primer bulb fits this 1/4" hose?
Use the Pro Marine 8002 1/4" Primer Bulb .

Can I use the same primer bulb with the 1/4" Type A hose?
Yes. Both the 1/4" Type A and Type B hoses use a 1/4" inside diameter, so the Pro Marine 8002 1/4" primer bulb is the matching hose size.

What if I need Type A 1/4" fuel hose?
Use the MPI 314-1 1/4" Type A fuel hose .

Which clamp fits the 1/4" Type A hose?
The Type A MPI 314-1 hose uses the Oetiker 4-170 ear clamp .

Why do the Type A and Type B 1/4" hoses use different clamps?
The 1/4" measurement is the inside diameter. Different hose construction changes the outside diameter, so the clamp must be matched to the specific hose.

Searchable Part Numbers & Terms

315-014, MPI 315-014, 1/4 fuel hose, 1/4 marine fuel hose, 1/4 boat fuel line, 1/4 outboard fuel hose, Type B marine fuel hose, Type B fuel line, marine fuel line by the foot, bulk marine fuel hose, above deck fuel hose, MPI fuel line, Oetiker 4-133, 4-133 fuel hose clamp, 8002, Pro Marine 8002, 1/4 primer bulb, marine primer bulb, outboard primer bulb, 314-1, 1/4 Type A fuel hose, Oetiker 4-170, marine fuel hose, outboard fuel line, boat fuel hose

How to Order Bulk Fuel Hose

This hose is sold by the foot. Select the quantity based on the total continuous length of hose required for your installation.

For example, if you need approximately 8 feet of fuel hose, order a quantity of 8.

What Does USCG Type B1/B2 Fuel Hose Mean?

Marine fuel hose classifications help identify where and how a hose is designed to be used within a boat's fuel system.

The "B" designation identifies marine fuel hose that does not carry the same USCG fire-test requirement as Type A hose. For that reason, Type B hose is commonly associated with exposed or above-deck fuel-line installations, while Type A hose is the appropriate choice where the installation requires the additional fire-resistant Type A classification.

The numbers "1" and "2" refer to fuel permeation performance. Type 1 is the lower-permeation classification and is the classification normally associated with fuel-feed hose intended to contain fuel continuously. Type 2 permits greater permeation and is used for applications such as certain fill and vent arrangements.

Complete Your 5/16" Fuel Line Setup

The correct hose is only one part of a reliable marine fuel-line installation. Pro Marine stocks the matching clamps, primer bulb and installation tools needed to build or service your fuel line.

Oetiker 4-153 Ear Clamp - 10 Pack

The matching Oetiker ear clamp for this MPI 5/16" Type B fuel hose. Provides a clean, secure connection at fuel fittings and components.

View Oetiker 4-153 Clamp

Pro Marine 8004 - 5/16" Primer Bulb

5/16" primer bulb for building or servicing a marine outboard fuel-line assembly using 5/16" fuel hose.

View 5/16" Primer Bulb

Oetiker Standard Jaw Pincer Tool

Installation tool for properly closing Oetiker ear clamps when assembling marine fuel lines.

View Oetiker Pincer Tool

Pro Marine Oetiker Clamp Pack with Tool

Complete assortment containing common Oetiker clamp sizes plus the installation tool. A convenient option for marine shops, technicians and customers servicing multiple hose sizes.

View Oetiker Clamp Pack

Mercury OEM 5/16" Fuel Hose Available

Mercury OEM 5/16" Silver Fuel Hose

Prefer the Mercury factory fuel hose? Pro Marine also stocks Mercury OEM 5/16" silver fuel hose sold by the foot.

The Mercury hose uses a different outside diameter than this MPI hose and therefore requires a different Oetiker clamp: 4-145.

View Mercury OEM 5/16" Fuel Hose

View Oetiker 4-145 Clamp for Mercury Fuel Hose

Why Doesn't Every 5/16" Fuel Hose Use the Same Clamp?

5/16" identifies the hose's inside diameter, not its outside diameter. Different hose constructions can have different wall thicknesses and therefore different outside diameters.

That is why this MPI 315-056 Type B hose uses Oetiker clamp 4-153, while the Mercury OEM 5/16" silver hose uses Oetiker clamp 4-145.

Always match the clamp to the specific hose being installed rather than selecting a clamp based only on the hose's inside diameter.

What This Fuel Hose is Used For

This 5/16" bulk marine fuel hose can be used when building, repairing or replacing fuel lines in compatible marine applications where USCG Type B hose is appropriate.

Selling the hose by the foot allows boat owners and marine technicians to build the required length and add the appropriate primer bulb, connectors, fittings and clamps for the specific installation.

Building a 5/16" Outboard Fuel Line

A typical 5/16" outboard fuel-line setup may require:

• 5/16" marine fuel hose
• 5/16" primer bulb
• Correct engine-side fuel fitting or connector
• Correct tank-side fitting or connection
• Correctly sized Oetiker ear clamps
• Oetiker pincer tool for clamp installation

The exact components depend on the engine, fuel tank and layout of the boat's fuel system.

Key Features & Benefits

• 5/16" inside diameter marine fuel hose
• USCG Type B1/B2 rated hose
• MPI Products marine fuel line
• Designed for exposed and above-deck applications where Type B hose is permitted
• Sold by the foot for custom-length installations
• Matching Oetiker 4-153 clamp available
• Compatible 5/16" primer bulb available
• Type A 5/16" alternative available for applications requiring Type A hose
• Mercury OEM 5/16" silver fuel hose alternative available

Need Help Choosing the Right Marine Fuel Hose?

Hose diameter is only one part of choosing the correct marine fuel line. The hose classification, installation location, fuel-system design, fittings, primer bulb and clamp size should also be considered.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is this fuel hose?
This hose has a 5/16" inside diameter.

Is the hose sold by the foot?
Yes. Order the quantity corresponding to the number of feet needed for your installation.

What does USCG Type B mean?
Type B marine fuel hose meets the applicable SAE marine fuel-hose performance classification but does not carry the same USCG fire-test requirement as Type A hose. It is commonly used in exposed or above-deck applications where Type B hose is permitted.

What is the difference between B1 and B2?
The number identifies the hose's permeation classification. Type 1 has the lower permeation limit and is normally associated with fuel-feed applications intended to contain fuel continuously. Type 2 allows greater permeation and is used for certain other fuel-system applications.

Can I use this hose below deck?
Fuel-hose requirements depend on the installation. For enclosed or below-deck installations requiring the Type A fire-resistant classification, use the 5/16" Type A fuel hose .

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

Which primer bulb fits this hose?
The Pro Marine 8004 5/16" Primer Bulb is the matching hose size.

Do you sell a Mercury OEM 5/16" fuel hose?
Yes. Pro Marine stocks Mercury OEM 5/16" silver fuel hose by the foot. The Mercury hose uses Oetiker clamp 4-145 rather than the 4-153 clamp used with this MPI hose.

Why are there different clamps for two 5/16" hoses?
The 5/16" measurement refers to inside diameter. Hose outside diameter can vary depending on wall thickness and construction, so the correct Oetiker clamp must be matched to the specific hose.

Searchable Terms

315-056, MPI 315-056, 5/16 fuel hose, 5/16 marine fuel hose, 5/16 boat fuel line, 5/16 outboard fuel hose, USCG Type B fuel hose, Type B1 fuel hose, Type B2 fuel hose, marine fuel line by the foot, bulk marine fuel hose, above deck fuel hose, outboard fuel line, boat fuel hose, Oetiker 4-153, 4-153 fuel hose clamp, 5/16 primer bulb, marine primer bulb, Mercury 5/16 fuel hose, Type A marine fuel hose, Type B marine fuel hose

How to Order Bulk Fuel Hose

MPI 314-1 is sold by the foot. Enter the quantity based on the continuous length of fuel hose needed for the installation.

For example, if you need 8 feet of 1/4" Type A hose, order a quantity of 8.

What is Type A Marine Fuel Hose?

Marine fuel hose classifications help identify the hose's intended application, permeation performance and fire resistance.

Type A marine fuel hose meets the applicable marine fuel-hose performance requirements as well as the additional USCG fire-test requirement associated with Type A hose.

This makes Type A hose the appropriate choice for fuel-system installations where the additional fire-resistant classification is required.

Where is Type A Fuel Hose Used?

Type A fuel hose is commonly used in enclosed and below-deck marine fuel-system installations and other locations where the fuel line must meet the Type A fire-resistant classification.

Always select marine fuel hose according to the requirements of the specific fuel-system installation rather than choosing hose based on diameter alone.

Complete Your 1/4" Fuel Line Setup

Pro Marine stocks the matching clamp, primer bulb and installation tools needed to build or service a 1/4" marine fuel-line system.

Oetiker 4-170 Ear Clamp - 10 Pack

The matching Oetiker ear clamp for the MPI 314-1 1/4" Type A marine fuel hose.

Clamp: 4-170

View Oetiker 4-170 Clamp

Pro Marine 8002 - 1/4" Primer Bulb

Matching 1/4" primer bulb for compatible outboard fuel-line assemblies using 1/4" fuel hose.

Hose Size: 1/4"

View 1/4" Primer Bulb

Oetiker Standard Jaw Pincer Tool

Installation tool for properly closing Oetiker ear clamps when building or repairing marine fuel lines.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool

Assortment of common Oetiker clamp sizes with the installation tool included. Ideal for marine shops and technicians servicing multiple fuel-line sizes.

View Oetiker Clamp Pack

1/4" Type B Alternative

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

Type B alternative for exposed and above-deck fuel-line installations where Type B hose is appropriate.

Inside Diameter: 1/4"
Fuel Hose Type: Type B
Matching Clamp: Oetiker 4-133
Primer Bulb: Pro Marine 8002 - 1/4"

View 1/4" Type B Fuel Hose

1/4" Type A vs. Type B Fuel Hose

Why Do the Type A and Type B Hoses Use Different Clamps?

Both hoses have a 1/4" inside diameter, which allows them to connect to compatible 1/4" fittings and the Pro Marine 8002 1/4" primer bulb.

However, the 1/4" measurement does not indicate the outside diameter of the hose. Different hose constructions and wall thicknesses result in different outside diameters.

The MPI 314-1 Type A hose uses Oetiker 4-170, while the MPI 315-014 Type B hose uses Oetiker 4-133. Always select the clamp for the specific hose rather than selecting it based only on inside diameter.

What This Fuel Hose is Used For

MPI 314-1 is intended for building, repairing or replacing marine fuel lines requiring 1/4" Type A fuel hose.

Selling the hose by the foot makes it suitable for custom-length installations and allows the hose to be paired with the appropriate primer bulb, fittings, connectors and clamps for the specific boat.

Building a 1/4" Type A Fuel Line

Depending on the application, a complete 1/4" fuel-line setup may include:

• MPI 314-1 1/4" Type A marine fuel hose
• Pro Marine 8002 1/4" primer bulb
• Correct tank-side fitting or connection
• Correct engine-side fitting or connector
• Oetiker 4-170 ear clamps
• Oetiker pincer installation tool

Exact component requirements depend on the engine, fuel tank and configuration of the boat's fuel system.

Primer Bulb Selection

Primer bulb fittings should match the inside diameter of the fuel hose. For 1/4" fuel line, use the Pro Marine 8002 1/4" Primer Bulb.

View Pro Marine 8002 1/4" Primer Bulb

Key Features & Benefits

• 1/4" inside diameter
• MPI Products marine fuel hose
• Type A marine fuel-hose construction
• Designed for installations requiring Type A fire resistance
• Common choice for enclosed and below-deck fuel-line routing
• Sold by the foot for custom-length installations
• Matching Oetiker 4-170 clamp available
• Matching Pro Marine 8002 1/4" primer bulb available
• 1/4" Type B alternative available
• Oetiker installation tool available
• Complete Oetiker clamp assortment with tool available

Need Help Choosing the Right Marine Fuel Hose?

Fuel-hose diameter is only one part of choosing the correct line. Installation location, Type A or Type B classification, primer bulb, fittings and the hose's outside diameter for clamp selection should all be considered.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is MPI 314-1?
MPI 314-1 has a 1/4" inside diameter.

Is this hose sold by the foot?
Yes. Order the quantity corresponding to the total number of feet required.

What type of marine fuel hose is MPI 314-1?
MPI 314-1 is Type A marine fuel hose.

Where is Type A marine fuel hose commonly used?
Type A hose is commonly selected for enclosed and below-deck installations and other applications requiring its additional fire-resistant classification.

Which clamp fits MPI 314-1?
Use the Oetiker 4-170 ear clamp .

Which primer bulb fits this hose?
Use the Pro Marine 8002 1/4" Primer Bulb .

Can I use the same primer bulb with Type A and Type B 1/4" hose?
Yes. Both hoses have a 1/4" inside diameter, so the Pro Marine 8002 1/4" primer bulb is the matching size for either hose.

Do Type A and Type B 1/4" hoses use the same clamp?
No. MPI 314-1 Type A uses Oetiker 4-170, while MPI 315-014 Type B uses Oetiker 4-133. The hoses have the same inside diameter but different outside diameters.

What if I need 1/4" Type B fuel hose?
Use the MPI 315-014 1/4" Type B Marine Fuel Hose for applications where Type B hose is appropriate.

Searchable Part Numbers & Terms

314-1, MPI 314-1, 1/4 Type A fuel hose, 1/4 marine fuel hose, 1/4 boat fuel line, Type A marine fuel hose, below deck fuel hose, enclosed marine fuel line, marine fuel line by the foot, bulk marine fuel hose, outboard fuel line, boat fuel hose, Oetiker 4-170, 4-170 fuel hose clamp, 8002, Pro Marine 8002, 1/4 primer bulb, marine primer bulb, outboard primer bulb, 315-014, 1/4 Type B fuel hose, Oetiker 4-133, MPI marine fuel line

How to Order Bulk Fuel Hose

This hose is sold by the foot. Enter the quantity based on the continuous hose length required for your installation.

For example, if your fuel-system layout requires 10 feet of hose, order a quantity of 10.

What is Type A Marine Fuel Hose?

Type A marine fuel hose is designed for installations requiring the additional fire-resistant protection associated with the Type A classification.

It is commonly used in enclosed and below-deck fuel-system routing and in other locations where Type A hose is specified by the boat builder, engine manufacturer or applicable installation requirements.

Fuel hose should always be selected based on both hose diameter and installation type.

Complete Your 3/8" Fuel Line Setup

Pro Marine stocks the matching clamp, primer bulb and Oetiker installation tools needed to build or service a 3/8" marine fuel-line assembly.

Oetiker 4-185 Ear Clamp - 10 Pack

Matching Oetiker ear clamp for this 3/8" Type A marine fuel hose.

Clamp: 4-185

View Oetiker 4-185 Clamp

Pro Marine 8005 - 3/8" Primer Bulb

Matching 3/8" primer bulb for compatible outboard fuel-line assemblies using 3/8" hose.

Hose Size: 3/8"

View 3/8" Primer Bulb

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

Assortment of commonly used Oetiker clamp sizes with the installation tool included. A convenient option for marine shops and technicians servicing multiple fuel-line sizes.

View Oetiker Clamp Pack

3/8" Type B Alternative

3/8" Type B Marine Fuel Hose - 375

Type B alternative for exposed and above-deck fuel-line installations where Type B hose is appropriate.

Inside Diameter: 3/8"
Fuel Hose Type: Type B
Matching Clamp: Oetiker 4-185
Primer Bulb: Pro Marine 8005 - 3/8"

View 3/8" Type B Fuel Hose

3/8" Type A vs. Type B Fuel Hose

Same Clamp for Both 3/8" Fuel Hoses

Both the 375-1 Type A and 375 Type B 3/8" fuel hoses use the same Oetiker 4-185 ear clamp.

That makes clamp selection simple when changing between these two 3/8" hose types. The main consideration is the required fuel-hose classification for the installation.

What This Fuel Hose is Used For

The 375-1 3/8" Type A fuel hose is intended for building, repairing or replacing marine fuel lines requiring 3/8" Type A hose.

Selling the hose by the foot makes it suitable for custom-length installations and allows it to be paired with the appropriate primer bulb, fittings, connectors and clamps.

Building a 3/8" Type A Fuel Line

Depending on the application, a complete setup may include:

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

Primer Bulb Selection

Primer bulb fittings should match the inside diameter of the fuel hose. For 3/8" fuel line, use the Pro Marine 8005 3/8" Primer Bulb.

View Pro Marine 8005 3/8" Primer Bulb

Key Features & Benefits

• 3/8" inside diameter
• Type A marine fuel-hose construction
• Designed for installations requiring Type A fire-resistant protection
• Commonly used in enclosed and below-deck marine fuel systems
• Sold by the foot for custom-length installations
• Uses Oetiker 4-185 ear clamp
• Matching Pro Marine 8005 3/8" primer bulb available
• 3/8" Type B alternative available
• Type A and Type B 3/8" hoses use the same 4-185 clamp
• Oetiker pincer installation tool available
• Complete Oetiker clamp assortment with tool available

Need Help Choosing the Right Marine Fuel Hose?

Fuel-hose diameter is only one part of choosing the correct line. Installation location, Type A or Type B classification, primer bulb size, fittings and clamp selection should all be considered.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is the 375-1 fuel hose?
This hose has a 3/8" inside diameter.

Is this fuel hose sold by the foot?
Yes. Order the quantity corresponding to the number of feet needed.

What type of marine fuel hose is 375-1?
The 375-1 is Type A marine fuel hose.

Where is Type A fuel hose commonly used?
Type A hose is commonly selected for enclosed and below-deck installations and other fuel-system applications requiring its additional fire-resistant classification.

Which clamp fits this hose?
Use the Oetiker 4-185 ear clamp .

Which primer bulb fits this hose?
Use the Pro Marine 8005 3/8" Primer Bulb .

What if I need 3/8" Type B fuel hose?
Use the 375 3/8" Type B Marine Fuel Hose .

Does the Type B hose use the same clamp?
Yes. Both 3/8" Type A and Type B hoses use the Oetiker 4-185 ear clamp.

Can I use the same primer bulb on Type A and Type B hose?
Yes. Both hoses use a 3/8" inside diameter, so the Pro Marine 8005 3/8" primer bulb matches both.

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

375-1, 3/8 Type A fuel hose, 3/8 marine fuel hose, 3/8 boat fuel line, below deck fuel hose, enclosed marine fuel line, Type A marine fuel hose, marine fuel line by the foot, bulk marine fuel hose, outboard fuel line, boat fuel hose, Oetiker 4-185, 4-185 fuel hose clamp, 8005, Pro Marine 8005, 3/8 primer bulb, marine primer bulb, outboard primer bulb, 375, 3/8 Type B fuel hose, marine fuel system, boat fuel line