I had a funny petrol smell in my vauxhall cavalier. Whenever I would turn on my fan, I would smell it, but if I turned it off, then it wouldn't be too bad. Open the bonnet and check all the fuel lines. I noticed that one of my fuel lines had a small cut in it, so if you were to just touch it while the engine was on, then the fuel would come out of that cut. Replacing it is cheap, but a little tricky if you're doing it for the first time, cos those fuel lines are awfully tight to fit round the pipes.
Mujahid, August 2005