6.9 Injector pump question (need help asap)
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Senior User
Joined: Oct 2003
Posts: 161
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From: League City TX
6.9 Injector pump question (need help asap)
A few mins ago ame and a buddy decided to try to turn the injector pump up on my 86 6.9. We red online that you have to pull the top cover off and adjust a hex nut. Come to find out that is no the proper way. We ajusted a hex nut on a long rod with a spring on it and replaced the cover. When we tried t ostart it it would not start. I reset the rod to the original position and replaced the cover. It is pumping fuel but will not start any help would be great. I need the truck for work tomorrow if i can get it running.
Thanks in advance,
Patrick
Thanks in advance,
Patrick
Elder User
Joined: Jan 2008
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From: Guymon
Um, The hex or allen screw you are looking for is accessed by removing the passenger side plate on the ip and turning it clockwise a coupple of flats making sure you DON"T screw it all the way in bottoming it out. You have to have the pump rotated in the correct degree to access the screw. I believe it is on #1 cylinder TDC but could be 180* off. Or you can have someone turn the crank with a ratchet while you watch the hole and see when the screw appears. You may need a little mechanics mirror on a stick to see it. I don't have a clue what you turned when you pulled the top of it off.
When you do try to start it again, I would keep something by you that you can put over the intake to sufficate the engine or at least slow it down till you get the fuel shut off like cardboard or a few rags if it has the metal intake screen.. If you put it together wrong or messed something up, It can run away. It has happend to me at work. Luckly I was ready in 5th gear and dumped the clutch (ouch) and still almost didn't die. Just to let you know so you don't hurt your engine. Someone else will have more details on adjustments though. Good luck
When you do try to start it again, I would keep something by you that you can put over the intake to sufficate the engine or at least slow it down till you get the fuel shut off like cardboard or a few rags if it has the metal intake screen.. If you put it together wrong or messed something up, It can run away. It has happend to me at work. Luckly I was ready in 5th gear and dumped the clutch (ouch) and still almost didn't die. Just to let you know so you don't hurt your engine. Someone else will have more details on adjustments though. Good luck
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
You may have installed the cover incorrectly. You have to place the cover on the top of the IP about 1/4" of its correct position and gently slide it back into position. If you don't put it on properly, the FSS will not do its job and you will have no fuel pressure.
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Senior User
Joined: Oct 2003
Posts: 161
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From: League City TX
Do i need to slide the cover foreward or backward. Also on the IP there are two plugs on it. I have power to both but the one closest to the radiator doesnt click like it used to. Is it possible that the selonoid isnt any good? Can they be purchased in stores if it has failed.
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Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
I have a picture of the IP top showing all the parts, but it is so bad you can't make out what you need to see.
There is a ground strap under one of the bolts, is it OK and in place?
Set the cover down forward of the final position, then slide it back gently.
If you do not hear the fuel shut off solenoid clicking, do not start the engine.
The govenor may be jambed wide open, engine failure will result.
There is a ground strap under one of the bolts, is it OK and in place?
Set the cover down forward of the final position, then slide it back gently.
If you do not hear the fuel shut off solenoid clicking, do not start the engine.
The govenor may be jambed wide open, engine failure will result.
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Thread Starter
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Senior User
Joined: Oct 2003
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From: League City TX
Well i wish i got that post about 10 mins ago haha. I moved the top around and got the truck to start and it ran at about 2500 rpms and would not shut off. It did not matter what you did with the accelerator pedal it stayed at a constant 2500. I unplugged the cutoff switch and it still ran. I finally found enough S*** to put over the intake to kill it. I know my way around a gas engine like the back of my hand but a diesel is a new beast to me. I guess thats what you guys ae for. Any ideas on what to do next? And yes the ground is ok.
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Joined: Jan 2008
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From: Guymon
Thats exactly what I did and thats way I posted that you need to keep stuff to put over the intake in my first post to be prepared. Your lucky, the truck I was working on whent way past 2500 and seemed like It was going to blow by the time i released that clutch in 5th gear and dumped the clutch which still didn't almost die. If It kept running, I was going to leave the truck until it quit or went boom..Don't know what would happen, but with that much mass turning that fast, I sure wasn't going to be huddled around that engine trying to shut it off. Well good luck.
Lead Driver
Joined: Nov 2003
Posts: 6,900
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From: Campbell River, B.C.
Not fun at all when it goes to full power with your foot off the pedal rattling like crazy and a cloud of smoke behind. Nearly had it run away at standstill and the manual tranny is the only thing that let me save it. Put it in 3rd, press the break and hope it holds when you dump it. Took me several weeks before I figured out what the problem was.
Laughing Gas
Joined: Mar 2006
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From: Fitzpatrick Alabama
If it was an automatic I don't know what I would have done, its not like when the injection pump runs away, because you can't loosen the fuel line, it wouldn't have done any good. Unfortunately your truck would be locked up from no oil before it would quit running.