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i hear this sound too and wondered what it is. oddly enough, my husband test drove a toyota fj cruiser last weekend, and there was a small notice wrapped around the gearshift that described a pump in the fuel tank that would activate within 5 hours after the vehicle is turned off to remove fumes (iirc) from the gas tank, and not to be alarmed by this sound. it made me think that there's something similar in the X3...
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2006 X3 3.0i
Black sapphire with terracotta Montana leather
Premium & sports packages, heated seats, privacy glass, and BMW iPod integration kit
My first BMW - I love it! 
www.macgirl.net
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