Other cars used to have a device that sensed vehicle roll-over. When the vehicle rolled, the fuel pump would not work.
Sometimes the device would fail, preventing flow of gas.
Hope this helps. I no longer have a Z4M, and don't know if this applies...but thought I would share just in case.
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DaveL///Toronto. http://www.ironring.ca/
My wife's cars: Had a few... I'm the Navigator, capable of getting us lost at any time! Drives are longer!
Last edited by DaveL--2mnycars; 04-05-2012 at 02:26 PM..
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