Everytime i turn my car off there is a strong gas smell around the car. I also get the smell through the A/C every once and awhile. I just had a diagnodtic test done and there wasent a single thing wrong with the car. No fuel leaks were detected. They aslo checked the pressure and return lines. Pressure was maintained and no leaks were found on return side. does anyone else have any ideas as to where the smell is coming from and what might be causing it?

 

I am having the same problem, car running rich. I took it to the dealer and they said it was running fine and there was no problem. Could be unburnt fuel in one of the combustion chambers caused by a slight misfire. When I opened the hood in the dark i saw several of my wires flashing faint blue light (arcing). I am going to change the wires and hope that was causing the misfire.

 

94FBODY's problem sounds like it is related to the EEC canister in the drivers side rear fender. This carbon filled canister collects fuel vapors from the tank, and then purges them into the intake manifold under certain engine operating conditions. If the lines are "rotted" between the tank and the canister (very common on a car as old as a 94) you will get excessive fuel smell when you shut off the car. That does not appear to be the same problem "ead94z28" is describing - his appears to be "running rich".

In addition to rotted vent lines, it could also be a problem of a carbon canister that is saturated with fuel, a failed fuel vent pressure relief valve, a plugged line to the front of the car, a failed purge solenoid, or a leak in the vacuum line between the purge solenoid and the intake manifold. In a 1994 (OBD-I) none of these problems would set a diagnostic code except the failed purge solenoid.

These problems can be made worse by a failing fuel pump that tends to overheat the fuel, and increases the vapor load to the carbon canister.

 

I don't know if this is true or not, but someone told me that you can also saturate the eec by overfilling your gas tank. ie: topping it 'way' up or overflow.

I had the same problem and kept failing emmissions (I capped out the HC reading on the machine)... ~$70 Canadian for a new EEC and it was fine.