S-Class (W126) 1979-1991: 300 SE, 300 SEL, 380 SE, 380 SEL, 420 SEL, 500 SEL, 560 SEL, 360 SEC, 500 SEC, 580 SEC, 300 SD TURBODIESEL, 300 SDL TURBO, 350 SD TURBO, 350 SDL TURBO

Strange thing under my car 1992 420 SEL

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Old 12-29-2004, 07:31 PM
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1991 420 SEL
Question Strange thing under my car 1992 420 SEL

New guy here, I have a 1992 420 SEL and under my rear axle there is a bosch compressor of some type and i cant figure out what the hell it does...
Any ideas ?
The manual doesnt say anything about it and I called the dealership to ask them what the hell its for and the guy was like You have what on a what? He had no idea either kept teling me to bring it in.
(Sidenoteealership is 1 hr 30 min away)
It doesnt do anything cept hiss when im idling and I dotn have any idea what this thing does and whether or not the hiss is good or bad.
Any thoughts would be appreciated.

Adrian
Old 12-30-2004, 10:16 AM
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Mercedes E 240 T Avantgarde
Well its probably your fulepump i belive.
Old 12-31-2004, 11:06 AM
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1989 560SEL, 1999 S600, 2005 S600, 2008 S550 4Matic
It is indeed your fuel pump. Hissing sound is good. Buzzing sound is bad, a indication it is about to die.

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