Turning up a p7100 fuel pump
 

One of my friends told me that he turned up the fuel screw on his 12valve and I was just wondering if anybody knew how to do that because I have no idea. Does anybody know where the fuel screw is?

there is no fuel screw on a p-pump that came in 94-98 trucks. here is alot of info on the p-7100 pump. https://www.dieselbombers.com/5-9l-1...-12-valve.html

there is a fuel screw on the VE pumps in the pre-94 trucks. here is alot of useful information on the VE pumps https://www.dieselbombers.com/1st-ge...-pump-you.html

oh ya


:hi:

No fuel screw on the P7100?:humm:

nope fuel plate

maybe he means the star wheel?

There is a screw on the back of the afc housing, commonly referred to as the "smoke screw". It's basically another fine-tuning adjustment as to when you bring the fuel on, in relation to boost. That's the only one I'm aware of.

The only way to turn the p7100 pump up that im aware of is to take the afc housing off and slide the fuel plate forward and loosen the star wheel and slide the afc housing forward and plug off the turbo wastgate

why would you want to plug the wastegate? a boost elbow is a way better choice. as for the pump there is also gov springs, mack plug, timing, dv's, and bigger dv's holders.

Lets just go all out Dave and say

you could always turn the barrels :w2:

should be a little plate you take off and you turn over the engine until a little allen head screw comes around the you tightin it to spread the arms the shoots diesel to each injector nozzle opens more but only turn it about a half or a 1/4 turn or you will blow it up :argh: but it will pour out some black smoke :rocking:

huh:humm:

well yes ... I have never done this yet. if you turn them to far the pump will run away and it should be benched after to make sure you get an even flow of fuel. I know it can be done on the truck , but when I do it for the first time its gonna get benched just to make sure.

I too wouldnt do it on the truck. I have never done it however I know a certin 180 sitting on a shop floor thats about to be sent off to push about 500cc's lol Your not going to find much info anywhere about this. Its a thing a shop will have to do so you dont have a runway like stated above.

I just thought this would be a good post to derail :choochoo:


As for the origanal question. A fuel plate and afc tunning will quickly overload the stock drivetrain.

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:WTF:

the reason i pluged my wastgate off is so it builds boost quicker but when you do that you have to watch your boost gauge so you dont blow your turbo

anything under 40psi and the stocker is fine for for a while anything past 35psi and all you make is heat...

p7100 pump
 

I was wondering if anyone knows how to get the screws out from the back of the afc housing? I have already turned up my star wheel and taken out the cam/plate. need help thanks guys!

HOW MUCH BOOST CAN MY TURBO HANDLE AN HOW CAN I KEEP IT FROM BLOWEN ....I DI THE SAME AS U ALSO...AN HOW CAN I MAKE IT SMOKE A LIL MORE ...ITS A 97 24V
NV4500 5 SPEED
:humm:

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did not mean to caps everything

35 psi is the max boost

A 97 is a 12v not 24v

Sounds like youre turning up an old Internation IDI to me... not a P7100 12v..

Turning up a p7100 fuel pump
 

Wow... That's all I have to say.
Yea that allen head trick isn't gonna work on a ppump.
This is where the search function comes in real handy.

how to turn up p7100 fuel pump
 

hey iam trying to get my truck to roll coal and i seen this post but does anyone have the photos to go with the information?? thanks i have a 1996 2500 cummins

Racking the barrels is a common practice, however for around 300$ -400$ you can send your pump out and have it maxed and balanced ... Add 4k's and its more fuel then most anyone will need ..... Most places won't help you if the only reason you want a high performance pump is to "roll coal".... I would rather make power and keep the smoke to a minimum... My pump max will flow 650cc's , with 5x14's it'll over fuel a 62/475 with the pump at 400cc's

I'd like to know what that 1/4 turn adjustment on the FRONT of the AFC does?... to me, from what I see in cutaways, perhaps it raises or lowers the AFC arm???

Thats what it does, I played with it and really no gains were had from it.

I guess it would be a way to fine tune it without having to unbolt the AFC housing

only time you really need to move it is if the gov arm is not making contact with the foot.

Yeah, but since it's cut on an angle, lowering it would make it contact a bit later

Anyhow, it's good to know what it actually does