2015 countryman, gas smell through vents
 

Please help! My 2015 mini Cooper countryman smells like gas through the air vents. I have taken it in two times to figure this out. The car has never been in an accident.They tried replacing the fuel rail, but that didn't work . There is no leak. Dealer can't figure it out! I take great care of it and it has never had any other problems until now. Frustrated. Anyone have an ideas? Sad....