C 2500 Truck 2WD V8-5.7L VIN R (1997)
Fuel Supply Line: Description and Operation
Nylon Fuel Pipes
WARNING: In Order To Reduce the Risk of Fire and Personal Injury: Always cover nylon fuel pipes with a wet towel before using a torch
near them. Also, never expose the vehicle to temperatures higher then 115°C (239°F) for more than one hour, or more than 90°C (194°F) for
any extended period. Take care not to nick or scratch the nylon fuel pipes. If damaged, they must be replaced.
Nylon fuel pipes are designed to perform the same job as the steel or rubber fuel tubes 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 in. ID for the fuel feed and 5/16 in. ID for the
fuel return.
The fuel teed and return 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 fuel tank ends of the fuel feed/return pipes and at the in-line fuel filter. They are described below.
Sections of the pipes that are exposed to chafing, high temperature or vibration are protected with a heat resistant rubber hose and/or corrugated plastic
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. 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 fuel pipes.
