Gas Fumes only when windows are rolled down?

It's usually a small leak in the gas line. You will have to jack up the car, put it on jack stands, then slide under and inspect the gas line from front to back. Should see a wet spot on the line or on the side of the gas tank itself. May have a pin hole in the tank. If you live in a state with road salt, the pipes will sometimes corrode on the very top of the tank. Almost impossible to notice until the gas starts dripping down the side of the tank.

Reelin68....Thanks alot for the response. I will check those areas.