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Yeah, glad you reminded me. So I had the injector pump removed and they found that it required a complete rebuild which was going to cost about $2500. So I bought an already reman'ed unit from one of common vendors and it fired right up and have had no troubles since. I was concerned I also...

So I have continued to fight this. I did a flush of the injector pump with straight fuel injector cleaner overnight. Basically filling the spin on filter with cleaner and hand pumping through and letting sit overnight. It seems to have helped a little but not much. I also tried adjusting the...

Mine does not auto-throttle up. I have to manually adjust it with the hand throttle.

Not really sure what you mean by power divider. At high idle it runs fine. It does not seem to handle load as well. For example in neutral transfer case in gear for the transmission with PTO locked in I can kill it at low idle very easy. Have to rev up over 1000RPM to not kill it.

I had a hard time finding the FG cummins cleaner so I was able to get some Penray Total Diesel Fuel System Cleaner off amazon and from what I read it is really good at cleaning up deposits, especially asphaltene. It seems to have helped. I dosed it pretty heavy in the tank and ran it for an...

Biodiesel sounds like an easy try. What causes it to clean things up. The fuel had a heavy varnish smell when I drained it. I smelled no hint of vegetable oil and I'm familiar with the smell of it as it goes bad. The varnish smell did have a slight sweet smell so I could buy into the sugar...

WillWagner thanks and I will try your suggestions. I thought I should include a picture of the spin on fuel filter I removed to give an idea of the buildup I am seeing. And the sludge/tar I drained out of the fuel tank after the E85 soak.

Brand new

Yes the lift pump was brand new. I would hate to count how many times I've pushed the prime button on the lift pump during all of this.

Well that is an interesting question. This lift pump just had a bolt in the spot were the fuel sensor went. It apparently had it removed at some point.

I don't have any way to do that. I could probably remove them and take them somewhere to test.

I have completely eliminated everything to the injector pump including the lift pump and all hoses by temporarily taking a new line from the lift pump to the tank through the fill hole in the tank.

I have a 1991 M936A2 that I recently acquired. I bought it knowing it had an issue running correctly. It will start only when given a little accelerator. It will only run from about 800 rpm up. From there it seems to run fine. Below that it stumbles and dies. If you let it idle down to...