I think your the first, most fuel pumps don't fail immediately as you've been lucky enough to find out which is at least a +. Bit shit they didn't listen to you diagnose the problem though. My SA at Pennant Hills listens to me now as I've diagnosed faulty coils and a stuffed MAF in my M3 when the DME was registering a faulty pre cat 02 sensor.
Did BMW openly admit there was a problem locally with the fuel pumps? Or did they act stupid?
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