Reinforced Fuel Hose – Ø7.5 mm / Ø9 mm (Gray, per meter)

This reinforced fuel hose is engineered to meet the strict demands of safety and reliability in your boat’s fuel system. It is composed of three primary layers: an inner layer of special fuel-resistant rubber (nitrile – NBR) that directly contacts the fuel; a middle layer – a braid of synthetic yarn (polyester or nylon) which provides tensile strength and pressure resistance; and an outer layer of gray PVC/rubber that shields the hose from external wear, UV rays, and saltwater exposure. This multi-layer construction ensures the hose won’t crack, harden, or leak even under prolonged use.

The hose is available in two diameters: 7.5 mm inner diameter (about 13.5 mm outer) and 9 mm inner diameter (about 15 mm outer). These sizes are standard for the fuel lines of most gasoline outboard engines (7.5 mm ≈ 5/16″ is very common) and some larger engines or diesel setups (9 mm ≈ 3/8″). The wall thickness of ~3 mm gives it a working pressure around 3 bar and an ample safety margin up to roughly 10 bar before the hose would begin to fail. In practice, this means the hose easily handles the pulsations from primer bulbs or fuel pumps and any thermal expansion of fuel, more than covering the needs of gravity-fed or low-pressure marine fuel systems.

Flexibility is a key advantage of this hose. The reinforcing braid allows the hose to bend sufficiently to route through tight spaces and around corners without kinking flat. At the same time, the braid prevents the hose from collapsing under sharp bends, maintaining the internal flow path. The gray outer layer is smooth, which helps when pulling the hose through holes and clamps, and it’s resistant to oils and petroleum – it won’t swell or degrade if it comes in contact with engine oil or grease.

Resistance to fuel and the elements is built-in by design (the hose meets standards such as SAE J1527 or equivalent, as indicated by the manufacturer). The nitrile inner tube can withstand modern unleaded gasolines with high ethanol content (up to E10–E15) and biodiesel blends without deteriorating. Additionally, the construction prevents fuel vapors from permeating out, reducing smell and hazard in confined spaces. The hose is suitable for all portions of the fuel line from tank to engine – use it to connect the tank to the primer bulb, into the fuel filter, and then on to the motor.

For installation, cut the length of hose you need with a sharp knife or hose cutter, aiming for a clean, straight cut. Push the hose fully onto the respective barbed fittings and secure it with fuel hose clamps. Check for leaks when you first pressurize the line. With this reinforced hose, you’ll gain peace of mind and long-term reliability in your fuel delivery, as it’s designed to outlast ordinary hoses, keeping your engine fed season after season.