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ErvGotti · 10-30-2011, 09:31 AM

The low pressure pump you hear when you unlock the car is priming the high pressure fuel pump. This ensures that the HPFP is not suffring small cavitations upon start up. It is not allowing the injectors to prime or squirt fuel in to the engine.

10-30-2011, 09:31 AM	#2
ErvGotti Major 124 Rep 1,362 Posts Drives: 2008 135i 6MT Join Date: Jul 2010 Location: Aviano iTrader: (5) Garage List 2008 135i [6.00]	The low pressure pump you hear when you unlock the car is priming the high pressure fuel pump. This ensures that the HPFP is not suffring small cavitations upon start up. It is not allowing the injectors to prime or squirt fuel in to the engine.
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