Fuel Filler Hose: Description and Operation

DESCRIPTION
The fuel filler pipe is of coaxial construction and consists of a central, fuel delivery tube inside of the molded, high density polyethylene outer pipe. The space between the outer pipe and inner tube is used to carry fuel vapors and control their entry back into the tank during the refueling process.

There are two other components in this fuel filler pipe (they are not serviceable).





Vapor Recirculation Valve
This valve (1) is part of the upper end of the filler pipe and allows some fuel vapors generated in the tank during refueling to be admitted into the liquid fuel stream dispensed from the fill nozzle. This helps to reduce the amount of vapor admitted to the EVAP canister during refueling.





Fuel Fill Check Valve
Located on the end of the inner fuel delivery tube; this one-way check valve prevents liquid fuel from rushing back up the tube when the fuel delivery is stopped. It also aids in controlling fuel tank vapors from traveling back up the inner filler tube.