id start looking for leaks in the fuel system and id prolly start with injector rubbers and the rubber patch hoses going to and from the fuel rail (they commonly deteriorate)
Yeah i've got the same problem.. its a real strong petrol smell. gets worse when i put the middle part of my back seat down...and when i put me boot into it.
ok guys i think i know your problem my brother had this happen to him
it turned out that either the filler rubber hose on the tank or the tanks breather hoses had perished not only causing fumes to get in the car but he was going though heaps of petrol aswell.
get under your tanks and find these hoses and make sure they are in good condition