Carburetion & Fuel | Mercruiser Engine

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

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How to Order Bulk Fuel Hose

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

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

Type B Marine Fuel Hose

Type B marine fuel hose is commonly used in exposed or above-deck fuel-system applications where that hose classification is appropriate.

Type B hose does not carry the same additional fire-test classification associated with Type A marine fuel hose. If the installation requires Type A hose, use the 3/8" Type A option linked below.

Complete Your 3/8" Fuel Line Setup

Pro Marine stocks the correct clamp, primer bulb and 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 B hose. This same clamp is also used with the 3/8" Type A hose listed below.

Clamp: 4-185

View Oetiker 4-185 Clamp

Pro Marine 8005 - 3/8" Primer Bulb

Matching 3/8" primer bulb for building or repairing marine outboard fuel-line assemblies using 3/8" fuel 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

Complete assortment of commonly used Oetiker clamp sizes with the installation tool included. A convenient setup for marine shops, technicians and customers servicing multiple hose sizes.

View Oetiker Clamp Pack

3/8" Type A Alternative

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

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

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

View 3/8" Type A Fuel Hose

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

Same Clamp for Both 3/8" Fuel Hoses

Unlike some of the smaller fuel-hose sizes, both of these 3/8" fuel-line options use the same Oetiker 4-185 clamp.

That means the clamp selection stays the same whether you choose the Type A or Type B 3/8" hose. The main decision between the two hoses is the required marine fuel-hose classification for the installation.

What This Fuel Hose is Used For

The 375 3/8" Type B fuel hose is used for building, repairing or replacing marine fuel lines where 3/8" hose and Type B construction are appropriate.

Bulk hose sold by the foot makes it possible to build the required length and pair it with the correct primer bulb, fittings and clamps for the specific boat and engine installation.

Building a 3/8" Outboard Fuel Line

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

• 3/8" Type B 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
• Marine Type B fuel hose
• Commonly used for exposed and above-deck installations where Type B hose is appropriate
• 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 A alternative available
• Type A and Type B hoses both 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 this 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 total number of feet needed.

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

Which clamp fits this 3/8" Type B 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 A fuel hose?
Use the 375-1 3/8" Type A Marine Fuel Hose .

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

Can I use the same primer bulb with the Type A hose?
Yes. Both hoses have a 3/8" inside diameter, so the Pro Marine 8005 3/8" primer bulb is the matching size for either hose.

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

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

Searchable Part Numbers & Terms

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