I had this issue off and on and during weather that is warm with high humidity. I get a gas smell underneath, but can't locate any leak, all dry. The recent occurrence happen yesterday after filling tank about 3/4th full. Smelled afterwards some and carried into the next day with humid air. I plan to keep checking, there is a cold front with dry air coming in tonight so will see if it still smells. i looked closely at the fuel neck but did not see any wet spots. About an hour ago I tighten the gas cap thinking it might not be on tight. This is a 1998 model. Any ideas on what is going on appreciated. If the smell stays, plan to have mechanic check.