Fuel Filler Pipe

The fuel filler pipe consists of a fuel delivery tube, vapor recirculating line and a separate vent pipe. The recirculating line is used to carry fuel vapor and control their entry back into the fuel tank during the refueling process. The vent line is used to vent air (after the fuel vapors have been captured by the EVAP canister) from the fuel tank during refueling or during thermal expansion of the vapor in the fuel tank.