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I have a 94 7.3 IDI factory turbo. Can somebody explain to me how to turn the fuel up? I don't have an egt guage yet so how much can i safely turn it up? I won't be pulling anything but I do tend to drive it pretty hard. And will this kill my mileage? I only get about 15 mpg now so I don't want it to get much worse.
 

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It's pretty simple to do you will need a 1/4" wrench or socket , 5/32 Allen wrench and I think a 15/16 deep socket to turn ur motor by hand on the harmonic balancer, a mirror and a flash light .......
First off there is a half diamond shaped plate on the passenger side of the injection pump remove the top bolt and loosen the bottom bolt and slide the plate out of the way. There is a bit of diesel that will spill out don't panic it will start back up with no problem .... now look into the side of the pump the mirror and flashlight come in handy for this part you will notice a hole in there look inside the hole and if your lucky you will see the Allen screw if not turn ur motor slowly clockwise checking the side of the pump frequently untill you find the Allen head .... once you have found the Allen head position the allen wrench as straight as possible in the Allen head ( a new name brand Allen wrench would be best .... you don't want any metal shavings inside your pump ) turn clockwise for more fuel and counter clockwise for less ...... I have mine turned up 1/2 a turn but I have a pyrometer and as far as my mpg it stays the same as long as I don't dog it more than usual .... I've always averaged 12mpg city and 18.8mpg highway so your driving will decide your mpg and just an FYI egts climb really fast when I'm hammering down on the highway I've seen 1200 many times but I let off when I seem there you don't want to go any farther than 1250 unless your wanting to see melted pistons and bent connecting rods their not pretty but look cool though seen 4 melted pistons on 3 different trucks ....... BE CAREFUL WHEN TIGHTENING THE BOLTS ON THE INJECTION PUMP THEY ARE ALUMINUM AND BREAK VERY EASILY I BROKE ONE OF MINE AND HAD TO PULL MY INJECTION PUMP OUT TO FIX IT ..... IP REMOVAL IS NOT FUN !!!!!!!!
 

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It's pretty simple to do you will need a 1/4" wrench or socket , 5/32 Allen wrench and I think a 15/16 deep socket to turn ur motor by hand on the harmonic balancer, a mirror and a flash light .......
First off there is a half diamond shaped plate on the passenger side of the injection pump remove the top bolt and loosen the bottom bolt and slide the plate out of the way. There is a bit of diesel that will spill out don't panic it will start back up with no problem .... now look into the side of the pump the mirror and flashlight come in handy for this part you will notice a hole in there look inside the hole and if your lucky you will see the Allen screw if not turn ur motor slowly clockwise checking the side of the pump frequently untill you find the Allen head .... once you have found the Allen head position the allen wrench as straight as possible in the Allen head ( a new name brand Allen wrench would be best .... you don't want any metal shavings inside your pump ) turn clockwise for more fuel and counter clockwise for less ...... I have mine turned up 1/2 a turn but I have a pyrometer and as far as my mpg it stays the same as long as I don't dog it more than usual .... I've always averaged 12mpg city and 18.8mpg highway so your driving will decide your mpg and just an FYI egts climb really fast when I'm hammering down on the highway I've seen 1200 many times but I let off when I seem there you don't want to go any farther than 1250 unless your wanting to see melted pistons and bent connecting rods their not pretty but look cool though seen 4 melted pistons on 3 different trucks ....... BE CAREFUL WHEN TIGHTENING THE BOLTS ON THE INJECTION PUMP THEY ARE ALUMINUM AND BREAK VERY EASILY I BROKE ONE OF MINE AND HAD TO PULL MY INJECTION PUMP OUT TO FIX IT ..... IP REMOVAL IS NOT FUN !!!!!!!!
 

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It's pretty simple to do you will need a 1/4" wrench or socket , 5/32 Allen wrench and I think a 15/16 deep socket to turn ur motor by hand on the harmonic balancer, a mirror and a flash light .......
First off there is a half diamond shaped plate on the passenger side of the injection pump remove the top bolt and loosen the bottom bolt and slide the plate out of the way. There is a bit of diesel that will spill out don't panic it will start back up with no problem .... now look into the side of the pump the mirror and flashlight come in handy for this part you will notice a hole in there look inside the hole and if your lucky you will see the Allen screw if not turn ur motor slowly clockwise checking the side of the pump frequently untill you find the Allen head .... once you have found the Allen head position the allen wrench as straight as possible in the Allen head ( a new name brand Allen wrench would be best .... you don't want any metal shavings inside your pump ) turn clockwise for more fuel and counter clockwise for less ...... I have mine turned up 1/2 a turn but I have a pyrometer and as far as my mpg it stays the same as long as I don't dog it more than usual .... I've always averaged 12mpg city and 18.8mpg highway so your driving will decide your mpg and just an FYI egts climb really fast when I'm hammering down on the highway I've seen 1200 many times but I let off when I seem there you don't want to go any farther than 1250 unless your wanting to see melted pistons and bent connecting rods their not pretty but look cool though seen 4 melted pistons on 3 different trucks ....... BE CAREFUL WHEN TIGHTENING THE BOLTS ON THE INJECTION PUMP THEY ARE ALUMINUM AND BREAK VERY EASILY I BROKE ONE OF MINE AND HAD TO PULL MY INJECTION PUMP OUT TO FIX IT ..... IP REMOVAL IS NOT FUN !!!!!!!!
 

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JR-LOPEZ, your truck is N/A, which is easier to over fuel. I believe a turbo truck can be turned up two "flats" but, you need an EGT gauge.
 

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Discussion Starter #6
Thanks for the help guys. Too bad my truck blew up before I got to do it. I started it and the throttle was stuck wide open. It lasted about two minutes.
 

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should have jammed your shirt in the intake. Only way to stop a runaway diesel is to kill its air.
 

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Ran away. The injection pump got stuck open. And yeah I thought about blocking the intake later. It was my first truck and my dad's first diesel so I guess it just came from inexperience. The motor had about 5k miles on a rebuild too.
 

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@Texas6.0 ..... I now my truck is n/a and I know they are a bit easier to over fuel than a turbo charged engine but if you would pay more attention you would notice that 1. I have mine turned up 1/2 a turn which equals out to about 3.5 flats and 2. I already have a pyrometer which is an EGT guage which anyone whose tampering with the air fuel ratio should have
 

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@ JR, have you ever thought that maybe your EGT's climb really fast when "hammering" on the highway because the pump is turned up too much on your N/A truck? The guys on oilburners.com suggest turning up the pump in 1/2 flat increments on N/A IDI's.

I know a pyrometer and an EGT gauge are the same thing, I just threw that comment in there because the OP wanted to turn his pump up without one.
 

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Naturally Aspirated
 

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@texas6.0
maybe his egts are high because hes "hammering" it
when im in the 12 valve and i get on it my egt gauge wraps around
(CUMMINS POWER):thumb:
 

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My buddy had his 6.9 with a 7.3idi pumped maxed out. Ran her for over a year till he sold it like that.. didn't burn anymore oil than before. Beat the living hell out of the thing too. No pyro. Ran that sucker up a mountain pass with a boat in tow flat footed the entire way up the hill at 35mph. Don't know how hot it got but ran perfectly fine. I dont really see how you could melt one of these engines.
 

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A stock N/A IDI can hit 1200* on the pyro fairly easily. Thats why turning it up some makes things scary. Can it survive? Sure, look at the poster above ^^^ but I would chance it. I want to kick the engineers of the big three in the nuts everytime they come out with a new truck, and they dont have a pyro. Its important to have, and gives you good baselines to base things.
 

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I had a 91had banks turbo kit on it 50 HP injectors I turned the injection pump all way up and it blew up too days later truck did have 200k but just way my experience went and I shouldn't turned it all way up but was young and dumb ha
 
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