901 injection pump issues

[TRUX01]

I have a 901D(961), it was getting fuel in the crankcase so I pulled and put a seal kit in the injection pump(roosa master DBGV). Everything is where it should be inside the pump and I've bled the air out of the inlet side but I'm not getting anything from the outlet. Any suggestions, before I pull it all apart again?

 

[used red MN]

Hello TRUX welcome to YT! Sorry if this is a little snide
but I feel it is a point that needs to be made. Are you a
trained and experienced person when it comes to
rebuilding injection pumps? These how to videos are
great, but they are just no replacement for a
knowledgeable and experienced person training you.
There is no better way then being shown something
hands on how do the task the proper way. There are a
lot of things that can be goofed up, on assembling one
of those pumps, something must not be right because
its not pumping fuel.
My recommendation is to contact a poster on these
forums that posts under Dieseltech. He runs a pumps
shop in Indiana. In the attached post he has a reply, his
email is open, contact him. You will likely end up
shipping your pump to him and having him fix it and
run it on his stand so you get back a guaranteed
working pump. FYI, you need to be logged in to see his
email button at the bottom of his reply.
Previous YT post

 

[Fritz Maurer]

If youre not cranking the engine , fuel is not going to flow
out of the pump anywhere. You would have to push it
past the transfer pump; I dont think you can static prime
that pump if it is dry.

 

[used red MN]

Fritz, you have a legitimate point but I would hope that someone who has taken the plunge into the tear down and reseal of an IJP would know that it has to turn to deliver fuel to the individual connections for the injector lines. Always interests me when I make a reply that I suppose is not necessarily what the poster wanted to hear then get no reply, what the actual reaction or thoughts of the poster are? I am sure he was looking for something like, you have the ginzulator in backwards and the dinkus screw is a half turn off. Correct these and it will function perfectly.

 

[TRUX01]

Thanks for the info used red MN and the reply to Fritz. I for sure know the engine has to rotate to get fuel out of it, and have been through loads of info on various sites about the same issue I'm having, so I'm down to stuck plungers and need to tear it down again. I peformed the work because 900+ for a rebuild isnt feasible. On a side note, I've seen a bunch of people post and get legitimate help and answers from years past before I posted and to get the replies I got......I should've just kept scrolling.

 

[used red MN]

You are thinking stuck plungers, on what basis? It ran
before just leaked fuel in the oil. I have watched very
few of the IJP repair videos so I do not know what level
of cleanliness they purvey. In my mind it is a good
possibility that this could have been the cause of your
problem if the plungers are stuck. Parts are brushed off and rinsed in a clean
pan of solvent then allowed to drip or are blown off
with compressed air. NOTHING TOUCHES OR IS
WIPED WITH A RAG, just too much of a possibility of
the lint causing problems. Best thing to set the parts
out on is newspaper or the old brown folding paper
towels you used to see in gas station bathrooms. Hope
you get it worked out.
Edit to add: Also you said $925 for a rebuild, I have no direct experience with Dieseltech but from what I have heard he has VERY reasonable prices. My guess is his price would have been somewhere above half that figure. Never know the third time may require his charm. Hope this edit on my iPhone does not blow the margin format out of wack.

This post was edited by used red MN on 08/19/2023 at 03:40 pm.

 

[Fritz Maurer]

Well, for the record , it thought you were waiting for fuel
to come out the return line on the pump cover, I knew you
had better sense than to think you could bleed the
injector lines via the pump inlet. But fuel is simply not
going to run out that port without the pump turning. It is
actually a self bleeding pump, and if no fuel is coming out
that port while cranking the engine, then the pump
housing is not full yet. If you have return fuel while
cranking, and nothing at the delivery lines, then yes you
have an internal deficiency of some sort. Sorry you got
the wrong idea.

 

[CCMnNC]

Not sure if anyone has mentioned this yet but the fuel injectors return line that is under the valve cover can leak fuel into the crankcase. The solder joints can leak and fuel drains into the oil return holes or the push rod holes.

 

[bbcrtny]

I had Dieseltech do a pump for me two years ago and it was half of what you say. Give him a call.