The fuel fill pipe/hose and fuel fill cap. Most common cause is the gas cap or a loose hose on the fuel filler hose or a cut in it.
The EVAP system purge pipe.
The EVAP vapor pipe.
The EVAP vent hose/pipe.
Check all vaccum hoses and pipes for cracks or cuts
The EVAP canister.
The EVAP canister vent valve.
The EVAP canister purge valve.
Have the canister checked.
The fuel sender assembly and/or seal.
The FTP sensor seal.
The fill limiter vent valve, pressure relief valve, rollover valves, and fuel tank
Thursday, January 3rd, 2008 AT 12:27 PM