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Could be a small gas leak in one of the gas lines or even a leak on top of the gas tank and yes could even be a leak where the fuel pump goes in the top of the tank. Quite often the leak is on the tank top out of sight and it smells of gas even if you have a slight leak.
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.
if inded the smell of exhaust is getting into your car i would suggest not driving it until it is properly checked by a licensed meachanic. it could be entering through your heater/AC blower and in return be fatal if left untouched for a period of time
SMELL GAS YOU NEED CHECK ALL FUEL LINES UNDER THE HOOD IN THE ENGINE COMPARTMENT.IF GAS IS STRONG UNDER HOOD YOU DONT SEE LEAKING FUEL LINES.YOUR FUEL RAIL FUEL INJECTORS LEAKING OR FUEL PRESSURE REGULATOR O - RING OR DIAPHRAM LEAKING GAS.IF FIND NO LEAKS UNDER THE HOOD CHECK FUEL LINES UNDER CAR FROM ENGINE TO FUEL TANK FOR LEAKS.IF ALL IS GOOD YOUR EVAPORATIVE CANISTER SOAKED WITH GAS OR YOUR EMISSION EVAPORATIVE SYSTEM NOT WORKING. DEALERSHIP HAS TO CHECK AND FIX.
I would definatly recheck the regulator to make certain you do not have any leaks.
But to be clear, you are smelling gas and not exhaust?
Also, is you cowl seal in good shape, not missing or damaged in any way?
Let me know.