I'm trying to diagnose a very tricky problem related to fuel delivery. Can someone explain to me why my car ('89 325i) has two fuel pumps, and anything about how they are used together? Are they both supposed to run all the time? How about at start-up, does only one run? Right now the car won't start and I don't have any power going to the second (axillary) fuel pump when cranking the ignition.
Thanks in advance. I can't seem to find an explanation of this anywhere.
Thanks in advance. I can't seem to find an explanation of this anywhere.
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