Fuel Return Line: Description and Operation

Rear Of Vehicle:

Under Chassis View:

Right Front Frame Rail:

The nylon fuel lines are designed to perform the same function as the steel or rubber fuel lines. The nylon lines are constructed to withstand the maximum fuel system pressure, exposure to any fuel additives, and changes in temperature.

The fuel feed, the return, the vacuum and the [1][2]EVAP lines are assembled as a harness. The retaining clips hold the lines together and provide a means for attaching the lines to the vehicle. The sections of the lines that are exposed to any chafing, high temperature or vibration are protected with a heat resistant rubber hose and/or a co-extruded conduit.

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