Quote:
Originally Posted by 777funk
The good thing is you can compare the bad port with the good ones. If it were my car, I would make sure that everything under the delivery valves looks the same, moves the same (nothing's rusted stuck, spring broken, issues with the plunger), etc.
But I wouldn't do that until I was 100% sure that #5 isn't delivering fuel and I would be super careful while looking inside the pump. You don't want any debris in there and of course don't want to lose anything. IP work is generally pump shop territory for what it's worth. That wouldn't stop me from doing basic (careful) inspection. Now doing anything further like fuel delivery balancing, etc, I wouldn't mess with that personally.
Also, I wouldn't pull the pump from the car until I did the above and also as someone mentioned looking under the side cover.
Getting a good used pump is a gamble unless you know 100% it came from a good working engine.
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Thanks Funk and DieselBenz! This is the kind of input I am looking for. Now the question is - am I safe to pull up the delivery valve without putting anything out of wack? I have seen youtube videos (Diesel Mercedes guy) who explains how to renew the dv o-rings and copper washers, BUT emphatically warns against messing with anything under the copper washers or you are "totally screwed." Since I don't want to be "totally screwed", I have resisted the temptation to remove anything under the copper washer, even though I can't see any type of setting which could get messed up. Short of loosing or messing up re-assembly of parts. I have no desire to mess with the balancing until I can determine why one delivery valve is not supplying hardly any pressure. Any idea what scenario could cause air bubbles in that one line? Are there any threads on cleaning and inspecting DVs? I am hoping there is some debris in #5 DV which is prohibiting fuel to fill the plunger.