Rubber Fuel & Oil Couplers

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Rubber Fuel & Oil Couplers

Rubber Fuel & Oil Couplers are engineered for performance, durability, and reliability in even the most demanding applications. Crafted from premium rubber compounds, these couplers are designed to handle fuel, oil, and various hydrocarbons, making them ideal for use in automotive, industrial, and marine systems.

With excellent resistance to high temperatures, pressure, and abrasion, they ensure a secure and leak-free connection between fuel or oil lines. Available in a range of sizes and configurations, our couplers provide a flexible solution for both standard and custom setups.

Which rubber fuel hose do I need?
For a general fuel or oil line, the Multi-Purpose hose in 5mm to 25mm - anti-static and very flexible. For small-bore carburettor and return lines, the Cotton Braided hose in 3mm to 12mm. For low-pressure gravity feeds and breathers, the Unreinforced hose in 3mm to 10mm. For boats, the ISO 7840 Marine hose. For high-pressure or exposed runs, the Stainless Overbraid.

Are they compatible with E5 and E10 petrol?
Yes - these are nitrile-based hoses formulated for modern ethanol-blended fuels as well as diesel and oils. This matters: ethanol attacks unsuitable rubber from the inside, so an old fuel line can look perfectly sound externally while breaking down internally and shedding debris into the fuel system.

When can I use the unreinforced hose?
Only on low-pressure work - gravity feeds, breathers, tank vents and transfer in 3mm to 10mm bores. It is a smooth extruded nitrile tube with no braid, so it has no pressure rating to speak of. Anything on a pressurised injection system needs a reinforced hose. If you are not sure whether a line is pressurised, assume it is.

What does anti-static mean and when does it matter?
Fuel flowing through a hose generates static electricity. An anti-static hose provides a conductive path so that charge dissipates rather than building up and discharging as a spark. It matters most on higher-flow transfer and decanting work. Our Multi-Purpose Fuel & Oil hose is anti-static for exactly this reason.

Why do I need a special hose for a boat?
Because a fuel leak on a boat collects in the bilge rather than draining away. ISO 7840 A1 is the fire-tested, low-permeation grade required for permanently installed fuel lines on recreational craft. Automotive hose is neither fire tested nor low-permeation enough, and surveyors and insurers will pick it up. Use marine hose on a boat.

What standards are they built to?
SAE J30 R6 for the multi-purpose and stainless overbraid hoses - the standard automotive fuel and oil specification. ISO 7840 A1 for the marine hose. DIN 73379 Type B for the cotton braided. BS EN ISO 11424:2007 for the unreinforced. Buying to a recognised standard is worth doing with fuel hose; it is not a place to economise.

  • Questions about Rubber Fuel & Oil Couplers?

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  • Need something bespoke?

    View our custom hose guide.

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