Gas in exhaust

A sure fire way of finding out where the gas smell is coming from is to park the car on some fairly fresh asphalt for a couple of hours, with a full gas tank. If you can find a spot on the asphalt that is starting to eat away look straight up from the spot and that is where the gas smell is coming from. It may travel a little ways away, but it will be close. If there is no spot, start the car and let it idle for a few minutes. If the unburnt fuel is coming out the exhaust, then there will be a spot under the end of the tailpipe.

Jack