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I am really hoping it isn't the pump although with my luck.... I will start tracking the return line and see what is going on there. It is also a real possibility that I have a restriction somewhere along the line.

Thank you all for your help and suggestions. Things have been crazy at work and other obligations have prevented me from spending the time on it I needed to. I went outside and ran a line from the pump to a fuel tank with fresh fuel and it still has the high idle problem. Where should I...

I probably wont have time to mess with it this weekend, but I plan to run a line straight from the pump to a fuel can of fresh diesel and see what happens. If I still have a high idle problem, I suspect it is in my pump. If that is the case, what would I need to look at on the pump to start...

I believe I only turned it down 4 clicks. I will go back out and put it back to the original setting in a few minutes. I have been looking at the diagnostic from Oregon Fuel Injection https://oregonfuelinjection.com/content/uploads/2016/08/cummins-pt-pump-diagnostic.pdf and I just keep coming...

Ok, I backed the screw off a few clicks. I fired the truck up and it died off pretty quickly so I suspected I had turned it a little to far. Gave it a pump and it fired right off and idled almost exactly where I wanted it. I bumped the throttle and it picked up idle back to the higher idle...

Ok, today is likely my only opportunity to work on this thing for the weekend. I've been going over the fueld lines and trying to make sure everything is as it should be. I am curious if there may be a crack in the pickup tube for the tank which may be introducing air into the system. Just a...

Sorry for the delay, back at work for the week and I don't have a lot of free time. It was a supply leak (pressure side) and was spraying all over. Right now I have the throttle linkage unhooked at the arm and it made no difference. I plan to tackle it again this weekend.

It pretty much goes straight to a high idle. As soon as it catches it moves up to the 1500 rpm range and stays there.

It was the fuel line from the pump to the front of the head. I was loose at both ends and spraying pretty good. I am hoping to work on it for a few minutes before I go to work tomorrow. If I don't, it will be the weekend before I can get back to it.

I unhooked the linkage and it didn't make any difference in the idle speed. I am doubtful I have the "specialty" tool needed to adjust the idle speed. I am happy to order whatever I may need but was curious how likely you think this is the problem? It is a last attempt type of thing or pretty...

Thank you guys. I will mess with it a bit more. I guess what is throwing me more than anything is how it was at a great idle speed. I turned it off and tightened a couple nuts then poof, high idle. It was leaking really good, I wonder if it is simply getting more fuel now causing the high...

Hello, I would like to start out by saying thank you to everyone who keeps helping me with my vehicle problems. This forum has been a great resource for getting my M817 closer to running. I have been working on my M817 for a little while and figure out what was keeping it from running. I can...

Yes, the tank is right over the exhaust. I may order a gasket set and tear into the cooler to try and what's going on. It sure pumped out all the oil fast. I guess that means the old pump is good.... I will give that a shot. I'm crashed today giving my body a little recovery time from...

Yes, the tank is right over the exhaust. I may order a gasket set and tear into the cooler to try and what's going on. It sure pumped out all the oil fast. I guess that means the old pump is good....

Ok, I may have lucked out. I would be beyond fortunate if what I think happened, actually happened. While I was looking the engine over, I discovered the oil may not have been coming out of the exhaust of the engine, just have been running off the exhaust. Further inspection revealed an open...

I'm going to do a thorough check tomorrow and try to figure it out. Still curious about the coolant building pressure that fast.

There is nothing showing on the dipstick now. It had a full 10.5 gallons in it. It was running like faucet unfortunately, I'm not entirely certain where from.

I need some help from someone who knows the Cummins NH250. I suspect best case scenario is a blown head gasket, but that would be lucky at this point. History; I acquired this truck from a person who bought a property and the truck came with it. The previous property owner advised he had...

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Ok, took a look at it last night when I got to work. The 90 is the part broken and the coupling is missing. I am sure the gladhand is not that hard to find but curious about the 90. Of course I didn't bring a wrench to work large enough to pull it so back at it tonight...