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M3 Adjuster · 01-03-2017, 06:28 AM

Agree with others. BMWs have a lot of tech in them. Merely press the door lock unlock button and it starts a system of clicks and whirs and pumps going. I'm pretty sure at least one of them is a priming pump or lift pump for the fuel system.

01-03-2017, 06:28 AM	#4
M3 Adjuster Banned 7906 Rep 11,785 Posts Drives: 1M, X1 M Sport, E46 325ic Join Date: Mar 2008 Location: Dallas, Tx iTrader: (0)	Agree with others. BMWs have a lot of tech in them. Merely press the door lock unlock button and it starts a system of clicks and whirs and pumps going. I'm pretty sure at least one of them is a priming pump or lift pump for the fuel system.
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