2002 Chrysler Grand Voyager Gas Smell

When I start my car, after it's been sitting awhile, like overnight or all day at work, the smell of gas is very strong inside the car. It does not appear to be leaking anywhere, i.E; gas level does not drop, no leakage on the driveway. After about 10 minutes it goes away, and if I do a lot of short driving it doesn't smell, only after it sits a long per. Of time. But the smell is very strong.