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      03-03-2013, 07:24 PM   #10
Snoozey_Monkee
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Drives: E39 520i, E92 325i, E90 335i
Join Date: Feb 2006
Location: London

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I know this is a rather old thread but I just bought an E90 335i and hear the same humming noise too. It happens with or without AC but usually comes on when the engine is warmed up. Dealer also told me its due to the high pressure fuel pump. Has anyone managed to get rid of this annoying noise??