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      09-23-2012, 05:39 PM   #2
Private First Class

Drives: E93 328i
Join Date: Oct 2010
Location: York, PA

iTrader: (0)

There's an electric pump that pressure tests the system for leaks whenever the car "wakes up". You may hear it cycle quickly when you open the door first thing in the morning.

I believe I posted a pic of this pump at one point. It's located inside the passenger side rear wheel well under the plastic shield. Its called a DTML Pump. Worth about $100 and takes about an hour start to finish. Easy job.

If its not a loose gas cap this would be my bet.