There has been a lot written about the petrol smell. This is usually due to problems with the vents on the fuel tank - on either side of the fill pipe. The hoses can come off, become cracked, etc. You can remove the protective cover by the spare tire, and check these very easily. The cars with the more basic emissions system (?) vented through a small canister in the right rear fender. The (slightly) more advanced emission reduction set up, vented through a larger plastic canister in the left rear fender well.