Whenever my wife filled my Sporting with petrol I could always smell it and it turned out that she never closed the fuel cap properly. All I did was firstly unlock the cap then put it on properly then lock it again then secondly I banned her from driving it.
Failing this, check that the vapour pipe is still firmly fitted into the inlet manifold. Its near the brake fluid reservoir. This was the cause of a petrol smell on my car after it was left unconnected after going to a Fiat dealer to have the alternator changed.