Car Tech forum: check engine lights

Take your Vehicle to your local Autozone they will do a free check on you engine light with an OBDII scanner. Note that the employee that is doing this may or may not be a mechanic. But generally with a evap code the vehicle will continue to run . The # 1 reason for those codes is due to loose or missing gas caps . #2 People fill the vehicle up while its running , never do this what happens is you get fuel into your vapor line blocking passage through the system creating higher fuel tank pressures and also saturating the evap canister with gasoline. #3 your canister purge or vent solenoid is bad not allowing the fuel vapors to circulate throughout the system releasing fuel tank pressure. #4 The fuel tank pressure sensor is bad and is getting a false reading. NOTE DO NOT DRIVE THE VEHICLE IF YOU SMELL GASOLINE OUTSIDE OF THE VEHICLE OR COMING THROUGH THE VENTS THIS IS VERY DANGEROUS..!!!

this is really a great piece of advice

my 07 cobalt has been throwing a error code saying excessive flow from the purge valve. i already checked case vents replaced fuel cap and tightened it down as much as possible.... the dealership said the couldn't find the code(dumb @$$es) but were able to delete it and told me it was fixed after "re tightening" my fuel cap once more. Guess what, just as i told the tech, the code came back and the car still stalls every time i get gas and now every now and then when just start the thing. Can any one help?