...assuming the nozzle is the correct, smaller diameter, then the inlet valve will not open since the switches will not be activated. Equals a mess, with gas spilling out the nozzle initially, but pretty much zero gas should get into the tank itself. Protects against those Darwin award winners employed by some dealers from the sounds of things. The BMW employee who took us through our PCD (props to Donny Isley, he was awesome!) explained that feature. Along with a specific case where someone got fcuked over when they accidentally selected the gasoline pump instead of the diesel one, and also had the misforture of having a larger diameter diesel nozzle mistakenly installed on said gasoline pump. So, as a result, the nozzle activated both switches and voila, was able to fill up the tank. D'oh!


Cheers