Thread: Hissing noise
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Old 03-27-2003, 11:40 AM
G-Benz's Avatar
G-Benz G-Benz is offline
Razorback Soccer Dad
Join Date: Apr 2001
Location: Dallas/Fort-Worth
Posts: 5,711
Definitely the fuel pump. The W124 models with the larger engine displacements have two.

It's protected by a plastic cover so you won't see it...the hissing is normal. If it starts to buzz loudly, it's a sign of impending failure.
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car
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