2009 BMW 335d Review

To reduce the chance that gasoline is mistakenly filled into the diesel fuel tank, there is a protection system. A standardized gas station nozzle is 21 mm in diameter and a standardized diesel fueling nozzle is 24 mm. If a nozzle smaller than the correct 24 mm diesel nozzle is used, a flap stays closed and prevents filling with gasoline. The misfueling protection won?t let the flap open unless the correct 24 mm diameter diesel nozzle contacts two release buttons and releases the flap lock.