True failure rates of the 6CTA8.3L injector pump?

[fuzzytoaster]

Your process is good. Go ahead and break open the injector lines from the injector before you start cranking to see if anything comes out. Even the slightest stream from one injector gives you the indication it could-maybe-possibly-sorta-kinda has a chance to loosen itself up and fire. Tighten up the lines that push fuel and hopefully you can get a few injectors to fire off and help self bleed the system given some run time.

 

[LCA078]

Think I see a problem already right above the banjo fitting on the lift pump there should be a sensor there or it should be capped off.

I'm not seeing a sensor in the TM (see attached) so not sure what you're referring to. Also, the pic of the motor is a pic I lifted from this forum and not the truck in question. I can't remember which thread I took it from so I can't give them credit.

But I think you just gave me an idea of how to easily attach an external pressurized fuel source. I'm guessing the plug (item #1 in the parts list) is just a 1/8" NPT and I can just screw in a barb fitting there to send pressurized inlet fuel to the IP. That would make troubleshooting so much easier. By the way, I'm also guessing the lift pump has a check valve in it to prevent backflow into the tank...otherwise this won't work without clamping/capping off the inlet.

 

[LCA078]

Your process is good. Go ahead and break open the injector lines from the injector before you start cranking to see if anything comes out. Even the slightest stream from one injector gives you the indication it could-maybe-possibly-sorta-kinda has a chance to loosen itself up and fire. Tighten up the lines that push fuel and hopefully you can get a few injectors to fire off and help self bleed the system given some run time.

That's a good way to start the troubleshooting process. That also brought back some old, but fond, memories as a young kid helping out on the farm. The punishment for us kids running grandpa's tractor out of diesel was that he would loosen the injector lines at the IP and then he would hand us the wrench. He would get back in the seat and cranked the engine to force the air out of the system and eventually start spraying diesel everywhere. Our job was to tighten the injector lines while he cranked to ensure no air got back inside. We usually received a fine coating of diesel in the process. No idea if he needed to crack open the lines that much but it did ensure we kept tabs on how much diesel we had.

Oh, forgot to mention the tractor fuel gage didn't work....just had a short piece of broom stick to dip in the tank to figure out run time.

 

[TechnoWeenie]

Oh, forgot to mention the tractor fuel gage didn't work....just had a short piece of broom stick to dip in the tank to figure out run time.

More accurate than .mil vehicle fuel gauges 99% of the time.

 

[LCA078]

I just found where I lifted the pic from my post #19- it's also from a post #19 in this thread: https://www.steelsoldiers.com/threads/m939a2-shifting-issues.213336/ Lots of good info that I used in building my troubleshooting

Thanks @Elijah95