Same problem a while back for me....the rubber seal around the filler tube was messed up where the tube enters the tank. I would smell it once I filled up with gas, but then as the gas level went down i wouldnt smell it anymore. I bought the gasket from dodge (cheap) took the tube out and replaced it, it's not too big of a deal but I would fix it as soon as possible. And on a side note, don't do what I did, fill up with gas then realize the problem and try to fix it with a full gas tank, but I'm an idiot sometimes. Hope this helps. By the way I have a 95 RT. If you need any help let me know.