ntc350 bc cummins no power in high gears?

There will be a plug on the side of the solenoid housing. Hook the filter back up, no use in junking a pump or injectors by running unfiltered fuel.

It should be where the tee comes out in this picture.

 

You also have to watch the old trucks had muffler problems were the muffler baffles would break loose and rattle up restricting the exhaust

 

Multiple things to look at for sure. Had a 76 W900 with a NTC 290 that got weak on power then harder to start, found water in the fuel lines and fuel tank, needless to say had to have pump redone. Our 92 L9000 at work has a N14 that fell on its face, our in house parts replacer worked on it for a week and never found the problem. I stopped in one Friday and he had it running, still working on it, I hit the throttle on the pump a few times and could barely make out a noise, turns out the air intake bolted to top of manifold had corrosion build up so bad it broke the mounting ears off the air intake housing and was losing air through the gaskets so it had no air pressure from turbo. Look for the little things first, pics may help here too...? Good Luck.

 

If you have been running big power before this, a 350 is going to feel gutless. I was running a 475 3406E years ago, and got into a 370 for a trip, and wondered what happened to the "beef?"

 

You have an issue with the pump and you are just randomly screwing with it, there are legitimate suggestions on this thread you started, but some good old boy you know told you to start adjusting stuff with out any #### explanation of what it does or how it affects your engine and you do that first?

Your not dealing with a #### cat, you are dealing with a big cam 4 cummins with low flow cooling where if you turn the wrong screw it over heats and you you junk an engine. SMFH.

 

Build a stinger and put in the pump and be done with it.....

1/8" drill bit
1/8" pop rivet
super glue
pair of side cutters or dikes as I call them.
Just kidding don't go that route, most people do more harm from simply not knowing the do's and do nots of a stinger.

when I drove for H&W I had a 1988 K100, 365 hp 855-9 SPD. Castrated so bad it was almost gutless, but being a company truck you didn't mess with it. We was hauling tubs from Bethleham steel in Penn to CSX in Raceland, KY. Pulled a little oldschool trick and was then out pulling a Pete hood with a castrated 3406 on I-79, couldn't outrun him but I could pass him before I got to the top, and never turned a bolt on the truck. Look for the little things first. How does the engine rev while in neutral? Snappy or sluggish? Does it belch a small puff of black smoke when you crack the throttle? Checked the fuel filters? I mean actually empty them on a rag and look for dirt / water?

 

It could be more that a fuel issue, a pt pump doesn't stop producing pressure to cause a low power issue in the high side of the transmission, it could be in the STC system control valve. Have you checked for leaks in the line that feeds the AFC?

Spend the money and buy a 300psi gauge and plumb it in and go for a drive with it hanging on the mirror.

Stingers aren't good for anything but rpm, they allow you to override the governor spring, that engine is fine turning 2400 rpm.