Tanks & tank accessories

The key factors are hose inner diameter (ID), connection type (spigot, thread, quick-connect), and, if applicable, the engine standard or series. Before ordering, measure: hose ID, spigot diameter, thread (e.g., BSP/NPT/metric), and check whether you need a gasoline or diesel hose. For outboard motors, the motor-side push-to-connect couplings are often manufacturer-specific—in this case, checking the existing coupling or part number will help.

Use only fuel-resistant hoses and seals that are approved for the respective fuel. Gasoline systems (especially those containing ethanol) place higher demands on material resistance. For diesel systems, resistance to diesel/biodiesel and clean filtration are important. Ensure clear product approvals and replace aged, hardened, or smelly hoses in a timely manner.

Proper venting prevents negative pressure in the tank (the engine doesn’t get fuel) and reduces the risk of odors and uncontrolled leakage. Vent lines should be routed without kinks, protected from splashing water, and installed so that no water can enter the tank. For issues like “engine stalls at full throttle,” the venting system is a typical point to check.

The key is tension-free routing (no pulling forces at connections), properly fitting hose clamps (correct size, ideally double-clamped at critical points), clean sealing surfaces, and fuel-resistant gaskets. Avoid kinks, chafing, and overly tight bends. After installation: Check for leaks (visually/by touch) and, especially with gasoline, pay close attention to odors and moisture.

A pre-filter is useful for many installations; with diesel, it is often used in combination with a water separator. It protects the pump and injection system from dirt and water. The installation location should be service-friendly (easily accessible for replacement) but protected from splashing water and heat. Note the flow direction, appropriate filter fineness, and hose dimensions.

Regularly check hoses, clamps, and connections for cracks, corrosion, and moisture. Replace the filter at the recommended interval or if symptoms arise (loss of power, starting problems). Check the tank and lines seasonally for water/contaminants (especially with diesel). In winter: Prepare the system according to the setup (drainage, venting, appropriate measures as specified by the engine manufacturer).

In practice, hose and tank components on board are often planned together (installation space, feed-throughs, abrasion protection). However, only hoses and fittings approved for drinking water may be used; wastewater requires odor-tight systems. If you are looking for accessories for water/sanitary tanks, the “Sanitary/Water” category is usually a better fit—different material requirements apply to fuel/oil.