Fuel Fill Pipe

Fig 1: View Of Fuel Filler Pipe Assembly

Courtesy of GENERAL MOTORS CORP.

The fuel fill pipe has a built-in restrictor in order to prevent refueling with leaded fuel. Once the fill vent is obstructed, fuel backs up the fill pipe and trips the dispensing nozzle. The fuel tank vent valves are connected and route to the canister to collect hydrocarbon emissions during operation of the vehicle.