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fuel pressure regulator ! $50.location/top right side engine.smells like gas in cab strong while parked with air /heat on . check this. mine started leeking gas after 60,000 miles. easy fix one star bolt/hose/gasket 15 minutes.
I had this problem and it was a leaking fuel tank (actually the place where the tube going to the place where you pump gas connects to the Gas Tank). The dealer fixed it for free, there was a special policy adjustment on this known problem.
Take the air cleaner off and open the throttle (have someone hold the gas pedal to the floor) and look down into the intake manifold, if you see gasoline, the Fuel Pressure Regulator may be leaking sometimes there are plastic fuel lines inside that can leak also. When either of these leak, the engine should run REAL BAD/RICH. Black smoke coming from tail pipe.
not much to go off here, but i would think if you are always smelling the gas after you shut it off and it is not someone around you, then yes, you have a leak. This leak could be the gas cap even. Sometimes o-rings on the fuel rail can go bad causing it to drain off the excess gas when shut off. but you would notice really bad gas milage. I hope this helps as your description was pretty vague.
I recently had the same problem. It turned out that the fuel regulator on the engine at the left side just above the intake manifold had an intermitent leak. The gas leaking was not always visible so I had the regulator changed and that solved the problem.
the first thing to do is look under the car at the plastic canister the vaper recovery system it is in the rear some times it is coverd by a sheild the vacuume hoses are bad if you smell gas and that will turn the light on it works off a pressure senser on the tank check all the hoses
May I suggest a locking gas cap. You could put a large piece of cardboard under your car and if there are any drops the next morning that smell like gasoline you might find the leak if there is one.