Fuel System - Howl/Whistle From Fuel Tank

SI B 16 09 10
Fuel Supply Systems

September 2010
Technical Service

SUBJECT
Howling Noise from Fuel Tank

MODEL
E89 (Z4 sDrive 3.0i and Z4 sDrive 3.5i) with N52K and N54 engines produced from 2/1/2009 and up to 12/31/2009

SITUATION
The customer complains that a whistling or howling noise is heard in the passenger compartment while driving at road speed.

CAUSE
The noise is caused by fuel system pulsations due to unfavorable fuel pump pressure limiting valve mechanical tolerances.

PROCEDURE

Replace the fuel pump in accordance with Repair Instruction REP 16 14 015 Removing and installing/replacing fuel pump.





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WARRANTY INFORMATION