Caprice V8-265 4.3L VIN W MFI (1995)
Fuel Return Line: Description and Operation
Nylon Fuel Pipes
Nylon fuel pipes are designed to perform the same job as the steel or flexible fuel pipes or hoses 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" ID for the fuel feed, and 5/16" ID
for the fuel return.
The fuel feed 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. Sections of the pipes that are exposed to chafing, high temperature or vibration are protected with 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. Also, once exposed to fuel, nylon pipes may become stiffer and are more likely to kink if bent too far. Some special care
should be taken when working on a vehicle with nylon fuel pipes.
WARNING: To Reduce the Risk of Fire and Personal Injury:
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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.
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Take care not to nick or scratch the nylon fuel pipes. If damaged, they must be replaced.
