1974 240d lift/supply pump - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 06-22-2013, 11:43 PM Thread Starter
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1974 240d lift/supply pump

Hello all.
Trying to eliminate all my fuel issues and the hardest one So far is the lift pump. If l am not using the right name it is the part mounted on the side of the injection pump where the hand primer is screwed Into. I hear about rebuild kits but I cant seem to find those. Can anyone turn me towards the right direction or at least a replacement ?. What it comes down to is wvo was used and the person let it gum up the system and so I am trying to get it all un- gummed if that is a word.
Also considering wvo was used could this cause my injectors not to work properly and myself knowing how vast this question is could this cause my car not to run ?. I know I have fuel in the inline filter and I know I have some fuel Coming from the fuel lines at the injector but l dont know if it is enough. I have bought new Monark nozzles but I would just like smeone to say whether I am crazy or not

Any help is always much appreciated
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post #2 of 5 (permalink) Old 06-23-2013, 12:16 PM
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Good luck....

I will never touch another wvo car in my life...

You will need to drop the tank and have it boiled, new tank screen and you need to blow out all the hard fuel lines.....

Your injectors are trash, they cannot be rebuilt.....most all the companies out there won't expect wvo injectors as cores....buy already rebuilt and tested injectors....

Get a whole new lift pump, I believe you have the old style....it's why you are having trouble locating a replacement.....you can buy and use the newer version found on all w123 cars.....photo will confirm which one you have....

If your lucky your injection pump isn't damage but there's a big chance the IP is also gunked just like the lift pump
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post #3 of 5 (permalink) Old 06-23-2013, 03:36 PM
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Vehicle: 1975 300D W115
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gasket kit for the feed pump


If you go to a Bosch fuel injection shop ask for kit DGK301. It is for the FP/K (22?)feed pumps which yours should be. There are many extra parts in the kit as this seems to be used on quite a few IP's. The kit is a stock item and cost me less than $20 CDN. Here is a picture of the kit:
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post #4 of 5 (permalink) Old 06-24-2013, 09:09 AM
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try starting car with 2 people , one in car and one under hood pumping the prime pump . make sure glow plugs are working , good battery , and cranking speed .carefull use of starting fluid . low compression due to bad engine or tight valves [ common ].another way would be if possible to pull car fast enough to have engine going .if you remove the injectors , poor a little motor oil in cylinders , and crank to lube cylinders , this will raise compression , and while injectors are out , see thru hole if glow plugs are working .
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post #5 of 5 (permalink) Old 06-24-2013, 09:32 PM Thread Starter
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Hello all thank you for all the good advice. I am really beginning to believe it is a fuel issue. I have adjusted the valves and it seems to have good compression. I put a little oil in the cylinders, and I know the glow plugs are working because I can feel them warming up the block. I ordered new nozzles and I will soon install those. I have been looking for a new lift pump but am really unclear as to what years will fit my car, and I ordered a rebuild kit for the lift pump, but again I dont know if I can rebuild mine that is currently on the car with this rebuild kit or if I should find another one. Open to any advice. I am going to get some diesel in a can and try bypassing all the other fuel lines behind the small inline filter. Can anyone tell me where to find a rebuild kit for the rear vacuum on the injector pump? Also another question I have is can a bad vacuum pump keep my engine from running?

Thank you all
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