Marine Fuel Rubber Hose ISO7840

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  • Rubber Marine Fuel & Oil Hose Rubber Hoses Hoses UK

    Rubber Marine Fuel & Oil Hose

    ISO7840 Standard A1 Spec Fuel & Oil Safe
    From £3.22
    From £3.22

Marine Fuel Rubber Hose ISO7840

Marine Fuel Rubber ISO7840 A1 / A2 made from resistant black NBR rubber reinforced by synthetic textile. Our marine hoses are designed to be easy to use, with lightweight designs, abrasion resistance, as well as completely crush-proof. All of our marine and wet exhaust hoses are available in many different sizes and lengths.

High tensile polyester fibres are weaved between the layers to provide the hose with reinforcement. The working pressure varies from 5 to 10 bar depending on the size, and is suitable in temperatures up to +100°C.

Sizes above 25mm also have an embedded steel wire helix reinforcement.

Marine Fuel Rubber Hose ISO7840 is a type of hose specifically designed for use in marine environments. It is manufactured to meet the standards set by the International Organization for Standardization (ISO) in the ISO 7840 standard. This standard specifies the requirements and test methods for small craft fuel hoses.

This hose is commonly used for transferring gasoline, diesel, and other types of fuel to marine engines and other onboard systems. It can also be used for transferring lubricating oils, transmission fluids, and other types of lubricants. The hose is designed to be highly durable and resistant to the chemicals and solvents found in marine fuels and oils.

The hose is also suitable for use in cold weather conditions as it is resistant to cracking and hardening. It is available in a variety of sizes, with different internal diameters, making it suitable for different types of vessels and fuel transfer applications.

What makes a hose a marine fuel hose?
Marine fuel hose is built and certified to a different standard from automotive fuel hose because a fuel leak on a boat collects in the bilge rather than draining away. Ours is manufactured to ISO 7840 A1 specification with a nitrile rubber inner tube, polyester braid reinforcement and a nitrile blend cover. ISO 7840 A1 is the fire-resistant grade required for permanently installed fuel lines on recreational craft.

What is the difference between A1 and A2 specification?
Both are ISO 7840 fuel hoses, but A1 has a much lower permeation rate and is fire tested, so it is the grade specified for fuel feed and return lines in engine spaces. A2 is a lower-permeation grade used where fire resistance is not required, such as some fill and vent runs. Our hose is A1 spec, which means it is suitable for the more demanding positions as well as the easier ones.

What sizes and lengths do you supply?
Internal diameters from 5mm up to 51mm, cut to order from 1 metre up to a 20 metre full coil. Sizes of 25mm and above include an additional wire helix in the wall, which stops the larger bores collapsing or kinking on tight routing - useful on fill and vent runs where the hose has to turn corners inside a locker.

Can I use ordinary automotive fuel hose on a boat?
No, and it is worth being blunt about this. Automotive fuel hose is not fire tested and typically permeates far more fuel vapour, which on a boat accumulates in an enclosed bilge rather than dispersing. Insurers and surveyors will pick this up, and it is a genuine safety issue. Use ISO 7840 hose for any fuel line on a vessel.

Is it compatible with E5 and E10 petrol?
Yes - the nitrile inner tube is formulated for modern fuels including ethanol blends, as well as diesel and oils. Ethanol is particularly hard on older hose, so if you are working on a boat that still has its original fuel lines, replacing them is worthwhile even if they look sound from outside. Ethanol damage happens from the inside out.

How should marine fuel hose be secured?
Use two stainless steel hose clips at every connection, which is what the standard expects for fuel lines below the waterline or in an engine space. Use 316 stainless rather than plated clips, support the hose so it cannot chafe against a bulkhead or engine mount, and keep it clear of the exhaust. Renew the clips whenever you renew the hose.

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