full power screw

[1991cummins]

another question... with the stock injectors on an intercooled model will it be able to run away or will it need bigger injectors to do it

[PToombs]

Oh yeah! Some trucks will runaway, some won't. It's all in the pump, how worn, how it reacts, etc. Never take a chance!

I just saw the other question! The fuel screw is on the engine side of the pump, near the back. It has a thin metal cover on it. If you take the cover off, you can see the hex head and the lock nut. The screw goes into the cover, not the main body of the pump. The idle screw is towards the front more. You will need to turn that down if you turn the fuel in.

[1991cummins]

thanks with the stock injectors how much more power do you think i can get out of that pump

[Power Ram Man]

i done it with tomtoms help over the phone i turned the full power screw until it hit the collar believe me it was frustrating but i got it and wow the power i got i can realy power brake and acually break loose on pavment!!!

[PToombs]

thanks with the stock injectors how much more power do you think i can get out of that pump

You should get close to 300 pretty easy. I'm around there and I still have stockers.

[1991cummins]

does anybody know of a good way to get the cover off... ive tried pullin on it, ive tried vice grips, ive tried even prying it off but nothing works

[1991cummins]

nvm that... i just clamped down onit with vice grips and started yankin the $hit out of it, and twisting it around and it finaly came off

[PToombs]

Oh Yeah! If all else fails, beat the piss out of it!

Glad you got it off! Now take the screw out and remove the collar, it's spot welded on.

[1991cummins]

thats a good theory lol, but anyways, once its turned all the way up will i have any temp issues, i dont have the money for gauges, but their next on the list, but with it up all the way should it be safe or should i wate till i get guages

[1991cummins]

do i take the screw out or the entire bolt and everything, cause i thought i just took everything out and then took off the collar so that i dont lose the known position

[gman07]

Yes, when you turn it up the EGT's will go up... how much depends on the pump, but maxing out pretty much any pump will create big issues. Get a pyrometer on there.

Take the nut off, then mark the threads to remember where to put it back. Take the screw off, get the lock collar off, clean the threads if necessary, and put the screw back in.

[PToombs]

Don't turn it in until you get gauges! At least get a pyro, then you know what it's doing. If you melt it, it'll cost more than gauges.

[TWorline]

What Pete said! I recently tore a Cummins 8.3 down, it had #3 & #6 piston melted, not a pretty sight at all. If you do that on a 5.9 it would cost you a new motor, some of the grooves in the sleaves were 1/8" deep.