I have had probs with gas smells that were due to old and worn out hoses. Perhaps you could check the condition of your hoses on your fuel system.
Other people here at CAC are more experienced than I, and you'll receive better ideas of where to check from them.
My '85 blew the fuel regulator gasket. What a disaster.....gas everywhere.
Is the smell coming from the front or the rear? I would let the car run for a few minutes, get out, pop the hood & see if you can see it leaking out from anywhere. Good luck....
Those are all good suggestions, but I would say you need to find it... I lost a car that way. If it is fter you stop the engine, it is probably the emissions (evaporative or purge) system, and it is easy for a hose leak to cause a problem that is not visable, because the odor is vapor (the most dangerous), and not liquid gas. To do this best, you need one of the service books from a parts store, they have a schematic or diagram of the layout. Additionally, there should by law be one stuck on a label under the hood.