87 420 fuel dist - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 07-13-2008, 08:39 PM Thread Starter
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Date registered: Jul 2008
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87 420 fuel dist

Hello Guys,
How you can help with this problem.

I mostly work on VW/AudI,BMW,PORSCHE I Have little experience with MB..And with that lack of info for resolving this problem is slim to non..Vehicle was brought to me on a wrecker.I discover all cyl are flooded, plugs are fowled,oil is contaminated with fuel.customer told me he pulled over to change tire vehicle wouldnt start after that.i checked return line,checked out fine,found ripped diapham on fuel dist reg replaced hoping it would fix problem no luck..check 9th injector operating fine,throttle plate nice and smooth and nice tension.after cranking for several times engine hydro locks with fuel.
Fuel pressures are 7 bars at pump
3.1 bars when cycling the key with fuel gauge between dist@reg"open loop" but drops to 0 when you let off the key.
3.2 bars during cranking
1-2 bars at test plug on right side of fuel dist
i can make vehicle run "but runs highly rich" by disconnecting fuel line from fuel dist to pressure reg and running line to fuel can..eliminating back pressure in fuel system.Im thinking fuel distributor but do to the cost i want to make darn sure its the problem before replacing it... so any help would be great thanks

Last edited by lrover76; 07-13-2008 at 08:42 PM.
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