I've had this happen with my 2000 323i before. I don't know what causes it and its only happened a handful of times. (funny enough it happened twice in a row at 2 diff stations too) It might be that certain pumps are more sensitive than others or something weird. try a different gas station and see if it works. If it isn't working after 3 stations maybe take it in?
Last edited by lovemygsp; 10-01-2012 at 09:32 AM.