Grand Prix V6-191 3.1L VIN M SFI (1998)
Fuel Return Line: Description and Operation
Fuel Feed and Fuel Return Pipes
DESCRIPTION
Nylon fuel pipes are designed to perform the same job as the steel or rubber fuel lines they replace. Nylon pipes are constructed to withstand
maximum fuel system pressure, exposure to fuel additives and changes in temperature. There are two sizes used: 3/8 inch ID for the fuel feed, and
5/16 inch ID for the fuel return and are used on the modular sender. Nylon fuel pipes are somewhat flexible and can be formed around gradual turns.
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 are
more likely to kink if bent too far. Special care should be taken when working on a vehicle with nylon pipes.
PURPOSE
The fuel feed and fuel return pipes carry fuel from the fuel sender assembly to the fuel injection system and back to the fuel sender assembly.