its worth checking the fuel pump sealing ring under the floor panel in hatch area, remove wooden floor on hatchbacks to find a metal hatch under this sits the fuel pump held in by a locking ring a big seal .
check the short rubber hose running from the back of the gas cap to the filler neck on the tank, I recently had this problem and looked to find that the four inch long hose had dry rotted and was leaking fumes into the car.
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