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#1
11-24-2009, 03:05 AM
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Fuel system trouble shooting
Does anyone have a systematic approach to diagnose a problem with the fuel system? I've got a starting problem that's been getting progressively worse, and now the 85 300CD just won't run.
Previously I would have to crank it for a minute in the morning (in FL and about 75*F in am) to get it started. Car would run fine until turned off. The longer the car was turned off the longer it would take to start during the day. A longer than normal start would occur when the engine was fully warmed up, so I don't think it's a glow plug issue, and all 5 were replaced 6 months ago. I suppose compression could be the problem, but I'm leaning toward the fuel system. I've tried switching the intake and return fuel lines to elliminate a clogged tank screen issue. Have bleed the system several times at the filter housing, and the injectors getting air bubbles every time. And now I'm just stuck. There must be a factory trouble shouting tree for diesels. If anyone can share such an approach I'd really appreciate it. Thanks, Ken 
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#2
11-24-2009, 03:12 AM
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Valve adjustment?
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#3
11-24-2009, 05:20 AM
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One major problem with Mercedes Diesels is that you really need German Hose Clamps on any conection.Don't buy the hose clamps that bite into fuel lines.
With your German clamps now you can tighten the hoses so they don't spin on a conection.I always trim the ends of a hose,when I replace a filter. Check your tank hoses too.I mean a fuel line may not leak,but suck air.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran
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#4
11-24-2009, 08:46 AM
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If you always have bubbles going to the injectors, I suspect fuel.
A few questions: WVO? B100? Ever change primary or secondary fuel filters- when? Does the primer pump make it better? A few things to try: Changing the fuel filters. The primer pump. Get it running, look at the plastic secondary fuel filter- You should see it trapping bubbles, you may see air getting sucked down. Put supply & return in a jar of diesel (mark them first, hard lines as well) prime it and start it. Get it running well, crack lines clear injectors of air. Shut it down, put the jar ABOVE the IP and walk away for a while. If it starts good, I think your system may be losing it's prime. Might be easier to just jack the rear end. It looks like it might be a bad lift pump or leaky lines causing you to lose prime.
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CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there?
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#5
11-24-2009, 09:40 AM
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Quote:
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Linear Mode
