my car smells like gas sometimes, but i've checked and there are no leaks in the lines or filler neck and the tank was replaced 2 years ago. there is no gas leaking only the smell of gas sometimes. i know the smell is comming from the rear storage compartment area but cant find out exactly where its comming from. any tricks on narrowing down where the smell is comming from? is it possible that the seal on the sending unit is bad? suggestions?