If you haven't driven the car in a while or if it's been sitting around for a couple of weeks, the seals may just be dry. Give it some time. If this is not the case, and the other answers above this post don't seem to work out, check the hoses and gasket around the fuel pump, located under the rear seat. It's a fairly common issue.
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under the drivers side..that is where the fuel lines run. I would get under there and check for moisture on/ near the lines. IF you cant see anything and the smell persists you should have a pro check it out...you dont want to be driving around in 3000 lbs bomb..