94 sentra can smell gas

I have a 94 Nissan sentra XE with about 55,000 miles and it and I had to have some seals replaced on the engine so that the oil and gas would not mix. But recently I?ve notes that I smell gas when I turn on the car and have the air on. Also on a side note how do you take of the inside driver side panel to get to the speakers there. Thank for any help in advanced.