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  #1  
Old 10-23-2007, 01:07 PM
myanoch's Avatar
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Join Date: Aug 2004
Location: Scranton Pa.
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Fluctuating fuel pressure

My 2000 sl500 had 2 codes p0170/p0173
did a search and found to be vac lead or mass air sensor
Not that this has anything to do with engine light But

My question is during the diagnostic end I checked fuel pressure
It was jumping at idle from 56 to 58 lb
when I increased speed it stabled out at 58lb
My question is this normal jumping pressure at idle and amount of pressure
55,000
Any help would be appreciated
Mike

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[B]Mike Y.
00 sl500 sport
88 560 sl (sold)

Last edited by myanoch; 10-24-2007 at 08:24 AM.
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  #2  
Old 10-23-2007, 01:16 PM
ILUVMILS's Avatar
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A fluctuation of 2 PSI is nothing to worry about.
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  #3  
Old 10-23-2007, 01:39 PM
myanoch's Avatar
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Join Date: Aug 2004
Location: Scranton Pa.
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Thanks for the help
My mistake that was a 60 lb guage
How is the 58 lb. not 68 as I stated
for total pressure
Sorry for the stupidy doing 10 things here at work
Doesn't help
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[B]Mike Y.
00 sl500 sport
88 560 sl (sold)
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  #4  
Old 10-24-2007, 08:22 AM
myanoch's Avatar
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Join Date: Aug 2004
Location: Scranton Pa.
Posts: 239
Found more information on the fuel filter
Just in case some needs to know
It has four fittings on it one from pump through filter and back to pressure
relief back to tank
That means you change filter better have relief valve in the new one
The pressure relief is set at 3.8 bar or around 55 #

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[B]Mike Y.
00 sl500 sport
88 560 sl (sold)
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