I'm having trouble getting fuel to the injectors on 1985 OM 617,in a 1985 GD300



I have worked on many diesels in my career, but his one has me stumped.


So far, I have:


rebuilt lift pump
new primer
verified pump drive shaft is keyed to vacuum drive gear
spline coupler to IP pump is present
replaced all fuel lines from tank to engine


I get good fuel flow when priming,to the fuel filter, but very little from the outlet from the IP(on the block side of the IP). Even cracking the fitting, to bypass the check valve doesn't help.


Am I looking at a stuck IP rack? The vehicle has been sitting for almost 5 years.

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I choose to be happy, even when the Mercedes is being awkward, lol