Riviera V6-3.8L SC VIN 1 (1995)
Fuel Return Line: Description and Operation
Nylon Fuel Pipes
FUEL FEED AND RETURN PIPES AND HOSES
The fuel feed pipe carries fuel from the modular fuel sender to the fuel rail assembly.
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.
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.
Fuel Pipe O-rings
The threaded fuel pipe connections are sealed with O-ring seals. Fuel pipe O-ring seals are made of a special material, and should only be serviced
with the correct service part.
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.
