Fuel Hose | Mercury Outboard

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

How to Order Bulk Fuel Hose

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

For example, if you need 10 feet of hose, order a quantity of 10.

What Does Type A Marine Fuel Hose Mean?

Marine fuel hose is classified according to its intended fuel-system use, permeation performance and fire-resistance requirements.

Type A hose meets the applicable marine fuel-hose performance standard and also meets the additional USCG fire-test requirement. This makes Type A hose the appropriate choice in marine installations where additional fire resistance is required.

Type A1 vs. Type A2

When Should You Choose Type A Fuel Hose?

Type A fuel hose is generally selected when the fuel line is routed through an area where the installation requires the additional USCG fire-resistant hose classification.

This commonly includes many enclosed or below-deck installations, as well as other fuel-system layouts where Type A hose is specified by the boat builder, engine manufacturer or applicable regulation.

Complete Your 5/16" Fuel Line Setup

Oetiker 4-170 Ear Clamp - 10 Pack

Matching Oetiker ear clamp for the MPI 313-1 5/16" Type A marine fuel hose.

View Oetiker 4-170 Clamp

Pro Marine 8004 - 5/16" Primer Bulb

5/16" primer bulb for compatible outboard fuel-line assemblies using 5/16" fuel hose.

View 5/16" Primer Bulb

Oetiker Standard Jaw Pincer Tool

Pincer tool for properly closing Oetiker ear clamps during marine fuel-line installation.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool

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

View Oetiker Clamp Pack

Other 5/16" Fuel Hose Options

MPI 5/16" Type B1/B2 Fuel Hose - 315-056

Type B alternative for exposed and above-deck installations where Type B hose is permitted.

Matching Clamp: Oetiker 4-153

View 5/16" Type B Fuel Hose

Mercury OEM 5/16" Silver Fuel Hose

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

Matching Clamp: Oetiker 4-145

View Mercury OEM Fuel Hose

5/16" Fuel Hose Comparison

Why Do Different 5/16" Hoses Use Different Clamps?

The 5/16" measurement describes the hose's inside diameter. It does not tell you the outside diameter.

Type A hose typically has a different construction and wall thickness than Type B or OEM hose, so its outside diameter can be larger even though all of the hoses have the same 5/16" inside diameter.

That is why the MPI 313-1 Type A hose uses the Oetiker 4-170 clamp, while the Type B hose uses 4-153 and the Mercury silver hose uses 4-145.

What This Fuel Hose is Used For

The MPI 313-1 Type A fuel hose is intended for building, repairing or replacing compatible marine fuel lines where a Type A fuel-hose classification is required.

Typical installations may include permanent marine fuel systems, enclosed routing areas and tank-to-engine applications requiring Type A1 fuel-feed hose.

Building a 5/16" Type A Fuel Line

Depending on the installation, a complete setup may require:

• MPI 313-1 5/16" Type A fuel hose
• Oetiker 4-170 ear clamps
• 5/16" primer bulb
• Correct tank-side fitting
• Correct engine-side fitting or connector
• Oetiker pincer installation tool

Key Features & Benefits

• 5/16" inside diameter
• MPI Products marine fuel hose
• Type A marine fuel-hose construction
• Low-permeation design
• Suitable for applications requiring Type A fire resistance
• Common choice for enclosed and below-deck installations
• Sold by the foot
• Matching Oetiker 4-170 clamp available
• Compatible 5/16" primer bulb available
• Type B and Mercury OEM 5/16" alternatives available

Need Help Choosing the Right Marine Fuel Hose?

Selecting the correct fuel hose depends on more than hose diameter. Installation location, fuel-hose classification, permeation rating, fittings, primer bulb and clamp size all matter.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is MPI 313-1?
It has a 5/16" inside diameter.

Is this fuel hose sold by the foot?
Yes. Order the number of feet required for your installation.

What is Type A marine fuel hose?
Type A hose meets the applicable marine fuel-hose performance standard and the additional USCG fire-test requirement.

Can Type A hose be used below deck?
Type A hose is commonly selected for enclosed and below-deck installations where the additional fire-resistant classification is required.

What is the difference between Type A1 and A2?
Type A1 is the lower-permeation Type A classification typically used for fuel-feed applications. Type A2 permits greater permeation and is used for certain fill and vent applications.

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

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

What if I need an above-deck Type B fuel hose?
Pro Marine stocks the MPI 315-056 5/16" Type B1/B2 fuel hose .

Do you stock Mercury OEM 5/16" fuel hose?
Yes. The Mercury OEM 5/16" silver fuel hose is also available by the foot.

Searchable Terms

313-1, MPI 313-1, 5/16 Type A fuel hose, 5/16 marine fuel hose, Type A1 fuel hose, Type A2 fuel hose, low permeation fuel hose, below deck fuel hose, enclosed marine fuel hose, marine fuel line by the foot, bulk marine fuel hose, tank to engine fuel hose, outboard fuel line, boat fuel hose, Oetiker 4-170, 4-170 fuel hose clamp, 5/16 primer bulb, marine primer bulb, Type A marine fuel line, USCG fuel hose

How to Order Mercury Bulk Fuel Hose

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

For example, if you need 6 feet of fuel line, order a quantity of 6.

Genuine Mercury Marine Fuel Hose

This hose is an OEM option for customers who prefer to use Mercury Marine fuel hose when servicing or building a Mercury outboard fuel-line system.

Its 5/16" inside diameter allows it to be paired with compatible 5/16" fuel-system components, including the Pro Marine 8004 primer bulb.

Complete Your Mercury 5/16" Fuel Line

Oetiker 4-145 Ear Clamp - 10 Pack

The matching Oetiker ear clamp for this Mercury OEM 5/16" silver fuel hose.

View Oetiker 4-145 Clamp

Pro Marine 8004 - 5/16" Primer Bulb

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

View 5/16" Primer Bulb

Oetiker Standard Jaw Pincer Tool

Standard-jaw pincer for properly closing Oetiker ear clamps during fuel-line assembly and repair.

View Oetiker Pincer Tool

Oetiker Clamp Pack with Tool

An assortment of commonly used Oetiker clamp sizes with the installation tool included. A convenient option for marine shops, technicians and customers working with multiple fuel-hose sizes.

View Oetiker Clamp Pack

Other 5/16" Marine Fuel Hose Options

Fuel-hose selection should be based on more than inside diameter. The required hose classification and construction depend on the location and design of the boat's fuel system.

MPI 5/16" Type B1/B2 Fuel Hose

5/16" USCG Type B1/B2 bulk marine fuel hose for exposed and above-deck applications where Type B hose is appropriate.

Matching Clamp: Oetiker 4-153

View 5/16" Type B Fuel Hose

5/16" Type A1/A2 Marine Fuel Hose

5/16" Type A marine fuel hose for installations requiring the additional Type A fire-resistant classification, including applicable enclosed and below-deck fuel-system installations.

View 5/16" Type A Fuel Hose

Mercury OEM vs. MPI 5/16" Fuel Hose

Both hoses have a 5/16" inside diameter, but they do not use the same Oetiker clamp. Always match the clamp to the specific hose being installed.

What This Fuel Hose is Used For

Mercury OEM 5/16" bulk fuel hose can be used when building, replacing or repairing compatible Mercury outboard fuel-line assemblies.

Bulk hose gives boat owners and marine technicians the flexibility to select the required length and combine it with the appropriate primer bulb, fittings, connectors and clamps for the specific installation.

Building a Mercury 5/16" Fuel Line

Depending on the installation, a complete fuel-line setup may require:

• Mercury OEM 5/16" silver fuel hose
• 5/16" primer bulb
• Correct engine-side fitting or fuel connector
• Correct tank-side fitting or connection
• Oetiker 4-145 ear clamps
• Oetiker pincer tool

Key Features & Benefits

• Genuine Mercury Marine fuel hose
• 5/16" inside diameter
• Silver Mercury OEM hose
• Sold by the foot for custom-length installations
• Ideal for building and repairing compatible Mercury fuel lines
• Matching Oetiker 4-145 clamps available
• Compatible 5/16" primer bulb available
• Oetiker installation tool and complete clamp assortment available
• 5/16" Type A and Type B alternative hoses 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 and the outside diameter required for the correct clamp.

Visit the Pro Marine Fuel Line Technical Center

FAQ

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

Is this genuine Mercury fuel hose?
Yes. This listing is for genuine Mercury Marine OEM fuel hose.

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

Which Oetiker clamp fits this Mercury hose?
Use the Oetiker 4-145 ear clamp with this Mercury OEM silver fuel hose.

Which primer bulb fits this hose?
The Pro Marine 8004 5/16" Primer Bulb matches the hose's 5/16" inside diameter.

Can I use an Oetiker 4-153 clamp on this hose?
The recommended clamp for this Mercury OEM hose is Oetiker 4-145. The larger 4-153 clamp is matched to Pro Marine's MPI 315-056 Type B 5/16" hose.

Why do two 5/16" fuel hoses use different clamps?
5/16" describes the hose's inside diameter. Different hose constructions can have different wall thicknesses and outside diameters, which changes the required clamp size.

What if I need 5/16" Type B fuel hose?
Use the MPI 315-056 5/16" Type B1/B2 Fuel Hose for appropriate exposed and above-deck Type B applications.

What if I need Type A fuel hose?
Pro Marine stocks 5/16" Type A1/A2 Marine Fuel Hose for installations requiring the Type A classification.

Searchable Terms

Mercury 100 fuel hose, Mercury OEM fuel hose, Mercury silver fuel line, Mercury silver fuel hose, 5/16 Mercury fuel hose, 5/16 Mercury fuel line, Mercury outboard fuel hose, Mercury bulk fuel line, Mercury fuel hose by the foot, OEM Mercury fuel line, outboard fuel line, boat fuel hose, 5/16 marine fuel hose, Oetiker 4-145, 4-145 fuel hose clamp, 5/16 primer bulb, Mercury primer bulb hose, bulk marine fuel hose

What is Type A1 Marine Fuel Hose?

Type A1 marine fuel hose is designed for fuel-feed applications requiring a marine hose with enhanced fire-resistant performance.

Type A1 hose is commonly used in permanent marine fuel systems and installations where the fuel line passes through enclosed or below-deck areas.

When selecting fuel hose, both the inside diameter and the required hose classification should be verified for the installation.

Why Use 1/2" Fuel Hose?

A 1/2" fuel line provides greater internal flow area than the more common 1/4", 5/16" and 3/8" marine fuel hoses.

It may be used in applications where the engine or fuel-system design requires a larger fuel supply line to support higher fuel-flow demand.

Always follow the engine or boat manufacturer's required hose diameter rather than increasing or decreasing hose size without verifying the fuel-system requirements.

Matching Fuel Hose Clamp

German-Style Hose Clamp - 4-4

Recommended hose clamp for the MPI 360-12 1/2" Type A1 marine fuel hose.

German-style hose clamps provide a secure connection for larger marine fuel-hose applications.

View German-Style Hose Clamp

Fuel Line Tools and Clamp Assortment

Oetiker Standard Jaw Pincer Tool

Useful installation tool for Oetiker ear clamps used throughout many marine fuel-line systems.

While this 1/2" hose uses the German-style clamp shown above, the pincer tool is useful when servicing other fuel-hose sizes that use Oetiker ear clamps.

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 marine shops and technicians servicing different fuel-hose sizes throughout a boat or engine.

View Oetiker Clamp Pack

What This Fuel Hose is Used For

MPI 360-12 is used when building, repairing or replacing a marine fuel supply line requiring 1/2" Type A1 hose.

Typical applications involve larger marine fuel systems where increased fuel-flow capacity is required and the installation calls for Type A1 hose.

Typical 1/2" Fuel-Line Setup

Depending on the boat and engine, a 1/2" marine fuel-line installation may include:

• MPI 360-12 1/2" Type A1 marine fuel hose
• German-style 4-4 hose clamps
• Fuel tank pickup or shutoff valve
• Fuel/water separator or filter assembly
• Engine fuel-system connection
• Application-specific fittings and adapters

Primer Bulb vs. Larger Fuel Systems

Smaller outboard fuel systems commonly use 1/4", 5/16" or 3/8" hose with an inline primer bulb.

A 1/2" fuel supply line generally indicates a higher-flow fuel system, and a hand primer bulb is not normally part of that configuration.

The engine manufacturer's fuel-system requirements should always take priority when determining hose size, fittings, filters and priming components.

Fuel Hose Size Comparison

Key Features & Benefits

• 1/2" inside diameter
• MPI Products marine fuel hose
• Type A1 marine fuel-hose classification
• Designed for fuel-feed applications requiring Type A1 hose
• Suitable for higher-flow marine fuel systems
• Common choice for enclosed or below-deck fuel-line routing when 1/2" hose is required
• Matching German-style 4-4 hose clamp available
• Primer bulb normally not used with 1/2" fuel-line systems
• Fuel-system installation tools and clamp assortment available

Need Help Choosing the Right Marine Fuel Hose?

Fuel-line diameter, Type A or Type B classification, fuel-system flow requirements, fittings, filters and clamp selection all need to match the boat and engine installation.

Visit the Pro Marine Fuel Line Technical Center

FAQ

What size is MPI 360-12?
This fuel hose has a 1/2" inside diameter.

What type of fuel hose is 360-12?
It is Type A1 marine fuel hose.

What is Type A1 fuel hose used for?
Type A1 is used for marine fuel-feed applications requiring the additional fire-resistant performance associated with Type A hose.

Can this hose be used below deck?
Type A1 hose is commonly used in enclosed and below-deck fuel-system installations when the fuel system calls for this hose size and classification.

Which clamp fits this 1/2" hose?
Use the German-Style 4-4 Hose Clamp .

Does this hose use an Oetiker ear clamp?
The recommended clamp for this hose is the German-style 4-4 hose clamp.

Does 1/2" fuel hose use a primer bulb?
A primer bulb is not normally used in a fuel system requiring 1/2" hose. Larger lines are typically used in higher-flow fuel systems with a different priming and fuel-delivery arrangement.

Should I use 1/2" hose just to increase fuel flow?
Use the hose diameter specified for the engine and fuel system. Increasing hose size without verifying the complete system is not a substitute for following the manufacturer's fuel-system requirements.

Do you sell fuel-line clamp tools?
Yes. Pro Marine stocks the Oetiker Standard Jaw Pincer Tool for fuel-line applications using Oetiker ear clamps.

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

Searchable Part Numbers & Terms

360-12, MPI 360-12, 1/2 fuel hose, 1/2 marine fuel hose, 1/2 boat fuel line, 1/2 Type A1 fuel hose, Type A1 marine fuel line, marine fuel supply hose, high flow marine fuel hose, large outboard fuel line, boat fuel hose, below deck fuel hose, enclosed marine fuel line, marine fuel line, German style hose clamp, 4-4 hose clamp, marine fuel hose clamp, bulk marine fuel hose, marine fuel system, fuel hose by the foot

What This Fuel Fill Hose is Used For

FILLHOSE-112 is intended for the fuel-fill portion of a permanently installed marine fuel system.

In a typical installation, the hose runs from the fitting directly behind the deck-mounted fuel cap down to the fuel tank's fill-neck connection.

Common applications include:

• Boat fuel tank fill hose
• Deck fill to fuel tank connection
• Replacement of aged or deteriorated marine fuel fill hose
• Boat restoration and fuel-system rerigging
• New permanent marine fuel tank installations

What Does USCG Type A2 Mean?

Type A2 is a marine fuel-hose classification used for compatible fuel-system applications including fuel fill and vent lines.

Under federal marine fuel-system requirements, Type A hose is constructed to meet a fire-resistance test. Type A2 is a Class 2 hose designation.

The important application distinction for this product is that Type A2 hose is suitable for a marine fuel fill or vent line. It should not be confused with the smaller Type A1 fuel hose commonly used in fuel-feed applications.

Matching 1-1/2" Fuel Fill Hose Clamp

German-Style Hose Clamp - 4-8

Matching clamp for the 1-1/2" fuel fill hose installation.

Pro Marine's 4-8 German-style clamp has a 27-51mm / 1.05-1.99" clamping range and is made from 316 stainless steel.

Secure the hose at the deck-fill fitting and fuel-tank fill neck according to the requirements of the installation.

View 4-8 German-Style Hose Clamp

1-1/2" Chrome Gas Deck Fill

Chrome 1-1/2" Gas Deck Fill - 3-5740

Universal 1-1/2" chrome gas deck fill for compatible marine fuel systems.

The fuel fill hose connects to the hose barb beneath the deck fill and routes gasoline down to the permanent fuel tank.

View 1-1/2" Chrome Gas Deck Fill

1-1/2" and 2" Fuel Fill Hose Options

Need 2" Fuel Fill Hose?

2" Type A2 Fuel Fill Hose - FILLHOSE-2

Larger Type A2 fuel fill hose for marine installations using a 2" tank fill and deck-fill connection.

View 2" Fuel Fill Hose

German-Style Hose Clamp - 4-9

Matching clamp option supplied for Pro Marine's 2" Type A2 fuel fill hose.

View 4-9 Hose Clamp

Fuel Fill Hose Installation Tips

• Match the hose inside diameter to the deck fill and fuel-tank fill connection.
• Use marine fuel hose specifically designed for fuel-fill applications.
• Use properly sized corrosion-resistant hose clamps.
• Make sure the hose is fully seated on each fitting before clamping.
• Avoid sharp bends that can restrict fuel flow while filling the tank.
• Route the hose so it cannot be crushed by batteries, storage or other equipment.
• Keep the hose away from sharp edges and moving components.
• Inspect the entire fill hose for cracking, hardening and deterioration.
• Check all connections for fuel seepage after installation.

When Should Marine Fuel Fill Hose Be Replaced?

Fuel fill hose should be inspected whenever the fuel tank, deck fill or surrounding rigging is serviced.

Consider replacement if you find:

• Cracking in the outer hose
• Dry, hardened or brittle hose
• Soft or swollen areas
• Abrasion or chafing
• Fuel odor around the fill-hose area
• Visible fuel seepage
• Damaged or heavily corroded clamps
• Hose that no longer fits securely on the fill fitting or tank

How the Marine Fuel Fill System Works

When gasoline is added through the deck-mounted gas cap, it travels through the large-diameter fuel fill hose and into the permanent fuel tank.

A separate fuel-tank vent system allows displaced air to escape while the tank is being filled.

The fuel fill hose, deck fill, tank connection and vent system all need to remain correctly routed and unobstructed for reliable refueling.

Key Features and Benefits

• 1-1/2" marine fuel fill hose
• USCG Type A2 hose
• Designed for deck-fill to fuel-tank applications
• Large diameter for marine fuel filling
• Matching 4-8 German-style clamp available
• Matching 1-1/2" chrome deck fill available
• 2" Type A2 fuel fill hose also available
• Useful for new fuel-system installations and replacement projects

FAQ

What size is FILLHOSE-112?
FILLHOSE-112 is 1-1/2" inside-diameter marine fuel fill hose.

What is this hose used for?
It connects the boat's deck-mounted fuel fill to the fill connection on the permanent marine fuel tank.

Is FILLHOSE-112 Type A2?
Yes. This hose is listed as USCG Type A2.

Can I use this as the fuel hose from the tank to the engine?
This product is intended as large-diameter fuel fill hose. Use the proper marine fuel-supply hose specified for the tank-to-engine portion of the fuel system.

Which clamp fits the 1-1/2" fuel fill hose?
Pro Marine pairs it with the 4-8 German-Style Hose Clamp .

Do you stock a 1-1/2" fuel deck fill?
Yes. Pro Marine stocks the 3-5740 Chrome 1-1/2" Gas Deck Fill .

Do you have 2" fuel fill hose?
Yes. Pro Marine also stocks FILLHOSE-2 2" Type A2 Fuel Fill Hose .

How do I know whether I need 1-1/2" or 2" hose?
Measure or verify the hose connection size on both the deck fill and the fuel tank. The replacement hose needs to match the fittings used in the boat's fuel-fill system.

Searchable Terms

FILLHOSE-112, 1-1/2 fuel fill hose, 1.5 inch fuel fill hose, Type A2 fuel hose, USCG Type A2 hose, marine fuel fill hose, boat gas fill hose, fuel tank fill hose, deck fill hose, gas tank filler hose, 4-8 hose clamp, 3-5740, FILLHOSE-2, marine fuel tank hose

What This Fuel Fill Hose is Used For

FILLHOSE-2 is intended for the fuel-fill section of a permanently installed marine fuel system.

In a typical installation, the hose connects the fitting underneath the deck-mounted gas fill to the fill neck on the fuel tank.

Common applications include:

• Boat fuel tank fill hose
• Deck fill to fuel tank plumbing
• Replacement of old or deteriorated fuel fill hose
• Boat restoration and fuel-system rerigging
• New permanent marine fuel-tank installations

What Does Type A2 Fuel Hose Mean?

Type A2 is a marine fuel-hose classification commonly used for fuel fill and vent applications.

The Type A designation indicates a hose intended for marine fuel systems where fire resistance is required. The A2 classification is used for specific fill and vent applications rather than the smaller engine fuel-feed line.

For this product, the important point is that it is designed as a large-diameter marine fuel fill hose.

Matching 2" Fuel Fill Hose Clamp

German-Style Hose Clamp - 4-9

Matching clamp for Pro Marine's 2" Type A2 fuel fill hose.

Use properly sized corrosion-resistant clamps to secure the fuel fill hose at the deck-fill fitting and fuel-tank connection.

View 4-9 German-Style Hose Clamp

1-1/2" and 2" Fuel Fill Hose Options

Need 1-1/2" Fuel Fill Hose Instead?

1-1/2" Type A2 Fuel Fill Hose - FILLHOSE-112

Smaller Type A2 marine fuel fill hose for installations using 1-1/2" deck-fill and fuel-tank connections.

View 1-1/2" Fuel Fill Hose

German-Style Hose Clamp - 4-8

Matching clamp for the 1-1/2" Type A2 fuel fill hose.

View 4-8 Hose Clamp

1-1/2" Chrome Gas Deck Fill

1-1/2" Chrome Gas Deck Fill - 3-5740

Pro Marine also stocks a 1-1/2" chrome deck fill for compatible marine fuel systems using 1-1/2" fill hose.

This deck fill is not the matching 2" connection for FILLHOSE-2, but it is available for installations using the smaller 1-1/2" hose system.

View 1-1/2" Chrome Gas Deck Fill

How a Marine Fuel Fill System Works

The fuel-fill system provides the path from the deck-mounted fuel cap to the boat's permanent fuel tank.

During refueling:

1. Fuel enters through the deck fill.
2. The fuel travels through the large-diameter fill hose.
3. The hose delivers the fuel to the tank's fill connection.
4. The tank's separate vent system allows displaced air to escape.

The deck fill, fuel fill hose, tank connection and vent system all need to be correctly sized and routed for reliable filling.

Fuel Fill Hose Installation Tips

• Verify the deck-fill and tank-fill connection size before ordering hose.
• Use hose specifically rated for marine fuel-fill service.
• Make sure the hose fully seats over each hose barb or fitting.
• Use properly sized corrosion-resistant clamps.
• Avoid tight bends and kinks that can restrict fuel flow.
• Plan the routing before cutting the hose.
• Keep the hose away from sharp edges and moving parts.
• Do not allow batteries or stored equipment to crush the hose.
• Check both ends for leaks or seepage after installation.

Why Fuel Fill Hose is So Heavy Duty

Fuel fill hose is much larger and more heavily constructed than the smaller fuel hose used to feed an engine.

It has to handle:

• Large volumes of fuel during refueling
• Marine vibration and movement
• Fuel exposure
• Heat and environmental exposure
• The bends required between the deck fill and fuel tank

Because of its construction, fuel fill hose can be relatively stiff. Planning the routing before installation is especially important.

When Should Fuel Fill Hose Be Replaced?

Inspect the fill hose whenever the deck fill, fuel tank or surrounding rigging is serviced.

Replace the hose if you find:

• Cracks in the outer surface
• Hard, dry or brittle rubber
• Soft or swollen areas
• Abrasion or chafe damage
• Fuel seepage
• Persistent gasoline odor near the hose
• Loose, damaged or corroded clamps
• A hose that no longer fits tightly on the fittings

Key Features and Benefits

• 2" marine fuel fill hose
• Type A2 construction
• Designed for deck-fill to fuel-tank plumbing
• Large-diameter marine fuel-system application
• Matching 4-9 German-style clamp available
• 1-1/2" Type A2 fuel fill hose also available
• Suitable for replacement and new fuel-system installations
• Helps provide a dedicated path from the deck fill to the fuel tank

FAQ

What size is FILLHOSE-2?
FILLHOSE-2 is 2" inside-diameter marine fuel fill hose.

What is FILLHOSE-2 used for?
It is used to connect a compatible deck-mounted fuel fill to the fill connection on a permanent marine fuel tank.

Is this a Type A2 hose?
Yes. FILLHOSE-2 is a Type A2 marine fuel fill hose.

Can I use this as the fuel-supply line to the engine?
This product is intended as large-diameter fuel fill hose. Use the correct marine fuel-supply hose for the tank-to-engine fuel line.

Which clamp fits this hose?
Pro Marine pairs FILLHOSE-2 with the 4-9 German-Style Hose Clamp .

Do you have a smaller fuel fill hose?
Yes. Pro Marine also stocks FILLHOSE-112 1-1/2" Type A2 Fuel Fill Hose .

How do I know whether I need 1-1/2" or 2" hose?
Verify the hose-barb diameter on both the deck fill and the fuel tank. The hose size needs to match the fittings used in the boat.

Why is fuel fill hose so stiff?
Marine fuel fill hose is heavily constructed for its application, which makes it less flexible than smaller engine fuel hose. Plan bends and hose routing before installation.

Searchable Terms

FILLHOSE-2, 2 inch fuel fill hose, Type A2 fuel hose, marine fuel fill hose, boat gas fill hose, deck fill hose, fuel tank fill hose, marine gas tank hose, rigid fuel fill hose, 4-9 hose clamp, FILLHOSE-112, 1-1/2 fuel fill hose, boat fuel hose, marine fuel tank plumbing