Fuel Return Line: Description and Operation

Under Car:

Engine Compartment:

NYLON FUEL PIPES
Nylon fuel pipes are designed to perform the same function as the steel or rubber fuel pipes they replace. Nylon pipes are constructed to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. Both fuel feed and fuel return pipe size is 5/16 inch ID.

The fuel feed, return, vacuum and EVAP pipes are assembled as a harness. Retaining clips hold the pipes together and provide a means for attaching the pipes to the vehicle. Quick-connect type fittings are used at the ends of the fuel feed and return lines. Sections of the pipes that are exposed to chafing, high temperature or vibration are protected with heat resistant rubber hose and/or coextruded conduit.

Nylon fuel pipes are somewhat flexible and can be formed around gradual turns under the vehicle. However, if forced into sharp bends, nylon pipes will kink and restrict fuel flow. Also, once exposed to fuel, nylon pipes may become stiffer and more likely to kink if bent too far. Special care should be taken when working on a vehicle with nylon fuel pipes.