starting issue

If you search this site you will find a lot of good info about your problem. You should have fuel and oil pressure when cranking the diesel with the pony motor. If you have good flow from the tank to the transfer pump, you ought to check the relief valve. Lots of info on that on the site. Next course would be to clean fuel tower and change fuel filters and then clean beyond to the injectors. If that doesn't improve the situation, search for info on the fuel rack. Last items would be injector lines and nozzles. Sorry to be so brief but there are better explanations already written to address any problem you have.

Thanks for the start. It builds oil pressure with the pup just not fuel and wasnt sure if it was suppost to with pup or not. I will look into it why its not building with just the pup now. Hope it's just as simple as the fuel filter. The rack moves freely checked that when i checked the drain for the pump as i had hi fuel dilution once.

My D2 5U was doing something similar to your D4 and it was a combination of rebuilding the fuel transfer pump and changing the filters that fixed the problem. It now runs like Toby's with the fuel pressure pegged out and starts easily.
Have a good evening.....Bill

Cysco - Did you rebuild your own pump or did you send it out to be rebuilt? And if so who did you use?

D8PETE..... I was under the direction of several of the guys here diagnosing, disassembly and putting the parts back together.A local machine shop did the resurfacing of the contact areas that were damaged and I bought the gaskets,. seals and springs from a couple different places. If you do a search here you can see what I had done.
Bill

I got some time to play around with her, Removed the plunger found it to be washed out, It was plastic and the new one is metal with a rubbery oring. Changed the fuel filters, streched the spring alittle. threw her all back together and cranking with the pup i can just about max the fuel pressure gauget out now 👍. Still had a rough start so pulled the valve cover and found 3 or the 4 intake valves were tight so reset them and will see tommrow how it starts.

Also found one issue i need to track down, one number 3 cylinder the push rod for the intake valve is not getting any oil were could it be plugged? All the other push rods are getting oil.

I believe you will have to take off the rocker shaft and wash out with kerosene etc. I had one like that on our 9U.

It's possible you could simply move the offending rocker arm to the side compressing the spring and try to flush out the oil port in the shaft.