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Old 03-27-2003, 07:32 AM
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Question Hissing noise

When I start my 200TE I can hear a hissing noise comming from the rear wheel of the car, only on the outside, it's not the tyre anyone any ideas ??? thanks in anticipation
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Old 03-27-2003, 07:37 AM
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Fuel pump might be mounted there. Do you have the reapir manual book or CD?

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Old 03-27-2003, 07:43 AM
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Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Which side of the car? If it's the right side and sounds like an exhaust leak, yes, it's the fuel pump. That's normal.
'93 400E
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Old 03-27-2003, 11:40 AM
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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 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car
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Old 03-27-2003, 02:08 PM
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Join Date: Jan 2002
Location: England
Posts: 1,841
Does the hissing occur for a second or two when you first switch the ignition on, then stop. If so, it's definitely the fuel pump.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
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