Stuck Fuel Delivery Valves: 220D - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 07-01-2015, 12:03 PM Thread Starter
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Date registered: Mar 2013
Vehicle: 1971 220D
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Stuck Fuel Delivery Valves: 220D

This one defies logic... I've not been getting fuel delivered to the #1 or #2 hard fuel lines from the injector pump. to make a long story short, Zeitgeist called it! The delivery valves are quirky. I thought of exchanging the little plunger from #3 to #2 to see if that would make a difference. Well, the plunger wouldn't even go into the pressure valve carrier (the little bored cylinder thingy). I measured them... plunger 4.99mm, hole 5.03mm... but it would get about 1/3 in and stick -- to the point of having to be knocked out with a nail drive through the back side.

SO, anyone know where a fellow can get some new delivery valves?

The Bosch pump is an M-style, FP/K 22 M13

With the pneumatic governor, it goes by PES4M 55C320RS47
model # 0400114059

But I'm sure the valves are pretty universal...
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post #2 of 4 (permalink) Old 07-01-2015, 02:38 PM
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I have a few delivery valves out in my shop, but I'm not sure what pump they're from. The ones I think are similar to yours are all gummed up solid. You might try soaking yours solvent and see if that frees them up. Another trick would be to run a little emery cloth in there to de-burr the bores and pins
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post #3 of 4 (permalink) Old 07-01-2015, 04:01 PM Thread Starter
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Thanks, buddy... As I said, you nailed the diagnosis. I was considering taking a polishing tool to them... after soaking them in some cleaner.
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post #4 of 4 (permalink) Old 07-03-2015, 01:16 PM Thread Starter
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Just want to check and see if this sounds right:

I soaked in diesel cleaner and took a fine polishing wheel to the plungers. Now one still won't open, but the other now is apparently stuck open. About four pumps on the primer pump pushes fuel out of that one, and in a few seconds, it recedes back down. It seems to be the collars of the plungers that are sticking so bad. They just seem too big. More polishing....
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