Thread: Hissing noise
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Old 03-27-2003, 12:40 PM
G-Benz's Avatar
G-Benz G-Benz is offline
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Join Date: Apr 2001
Location: Dallas/Fort-Worth
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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.
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