Hombre S Regular Cab 4WD V6-4.3L (1999)
Evaporative Emissions Hose: Description and Operation
Nylon Fuel and EVAP Pipes
Nylon fuel pipes are designed to perform the same job as the steel or flexible fuel pipes or hoses that they replace. Nylon pipes are constructed to
withstand maximum fuel system pressure, exposure to fuel additives and changes in temperature. There are three sizes of nylon pipes used: 3/8 in. ID for
the fuel feed, 5/16 in. ID for the fuel return and 1/2 in. ID for the vent. Heat resistant rubber hose and/or corrugated plastic conduit protect the sections of
the pipes that are exposed to chafing, high temperature or vibration.
Nylon fuel pipes are somewhat flexible and can be formed around gradual turns under the vehicle. However, if nylon fuel pipes are forced into sharp
bends, the pipes will kink and restrict the fuel flow. Also, once exposed to fuel, nylon pipes may become stiffer and are more likely to kink if bent too
far. Take special care when working on a vehicle with nylon fuel pipes.
