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Old 01-11-2007, 09:32 PM
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Join Date: Dec 2006
Location: Alpharetta GA
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89 560sel rusty fuel lines/ add inline fuel filter?

560 SEL Rough Idle (Another one!) ( 1 2 3 4)
06-25-2002 01:24 PM
by hbofinger
482,053Tech Help
06-12-2002, 09:10 AM
Posts: n/a

Had the same thing on my 88 560sel - did all your stuff same thing. What worked for me was replacing the fuel lines. They were so rusted inside that one broke in two from it's own weight when we removed it. The rust is not trapped in the fuel filter as the filter is in the back of the car and the fuel picks up the rust and takes it to the fuel distributor. Take the injector lines off the fuel distributor and carefully pull out the screen in each injector line hole. I think you will find them partially clogged with dirt. I cleaned my screens and replaced them - you can put new ones in - but check your fuel lines first. Before i changed my fuel lines - I cleaned the screens and the car idled perfectly for about 100 miles and started to act up again. Try cleaning or replacing your screens - they are cheap from Phil and if the problem goes away - then you know to change your fuel lines. The oil guage on mine fluctuated the same way - the tach barely showed the missing but you sure could hear it and feel it - it was annoying. Hope this helps you.
Just had a crazy thought - if you do have rust in your lines and want a cheap fix (I didn't think of this until now!) cut the fuel line in two just before it goes into the fuel distributor and cut off about 3" of line and put in an aftermarket - cheap inline fuel filter with rubber hoses. Clean your screens and that should work . If you get one of the see through fuel filters you should be able to see the rust in it after you drive for a while. Surprised Mercedes didn't use one up front for contaminants from the long fuel lines.

Hi guys I have been searching the old post on rough idle and rust in the fuel lines. found the above thread and post about installing an inline fuel filter just before the fuel distibutor. Has anyone else done this? Can this be done? If so What is the fuel pressure and flow that this inline filter would have to work under? I have replaced my fuel filter in the rear and ran a couple of tanks of injecter cleaner through it. When I crack the lines coming out of the fuel distriutor I get a good amount of rust , then a few hundered miles later I get more out. Would an inline filter work? Thanks for any thoughts in advance. Tom 89 560sel 209k miles (new to me)

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Old 01-11-2007, 09:41 PM
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Join Date: Dec 2000
Location: Battle Ground, WA
Posts: 576
DO NOT - I repeat - DO NOT install a cheap aftermarket filter with see through case in the high pressure fuel line of your Mercedes. The result will soon be an engine fire, or at the very very least, an extremely dangerous situation as the 85 - 90 psi in the fuel line blows the rubber connectors right off the steel lines and sprays fuel all over the engine. What COULD be done is to add a high pressure fuel filter, similar to what L-jetronic vehicles like the Nissan 280Z's used, but it would have to be plumbed in with high pressure fittings and lines.
Just my two cents worth.
Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C
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Old 01-11-2007, 10:04 PM
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Join Date: Dec 2006
Location: Alpharetta GA
Posts: 74
Richard, Thanks for the info. thats good to know. I had no idea they worked under that kind of pressure. BUT.. it could be done with the right filter and the right fittings, correct?? What kind of flow would the filter need to handle? Tom

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