Originally posted by: crustyoldman
The gas tank must be under pressure for the fuel injection to work properly. Do you hear a pressure let off sound when you open the lid? Maybe the lid is cracked.
What the hell are you talking about,this has to do with OBDII emissions,it has nothing to do with the fuel injection system,the pressure sensor has detected that either the gas cap is not tightened all the way,it is defective or there is a open breach in the canister purge system.
This is to prevent fuel vapors from entering the atmoshere,here's what you do,shut off the vehicle,wait 15 minutes,unscrew the gas cap,reinstall the cap making sure that it "clicks" when fully tightened,restart vehicle and drive for at least 15 minutes at speeds above 35 MPH.
If the light sill stays on,then there is a problem with the system.