full power fueling screw

[DieselLam]

I found the screw but i was not able to access it with a flat head. Any more sgesstions

[1arock]

The full power screw has a 6mm head. I used a socket to turn mine.Rocky

[DieselLam]

So did you back it out take off the collar and.then install it then turn it up to about 4 turns?x

[oldestof11]

Take the screw out, get the collar off, use a dremel to open up the messed up threads, put back on, have board ready to snuff the truck out.

[vwkaferman]

Shoot. I've got my power screw ALL the way in, feels like a dog. Wouldn't start after I had the VE pump out for a few seals replacement. Someone here recommended turning the screw in, wala, started. Would this indicate that the throttle shaft needs to go a notch or two the other way? Sorry for the thread jack, thought appropriate since we're talking about the fuel screw.

James

[cmann250]

Shoot. I've got my power screw ALL the way in, feels like a dog. Wouldn't start after I had the VE pump out for a few seals replacement. Someone here recommended turning the screw in, wala, started. Would this indicate that the throttle shaft needs to go a notch or two the other way? Sorry for the thread jack, thought appropriate since we're talking about the fuel screw.

James

If your fuel screw is all the way in, you'd almost surely have run away, unless your throttle was indexed wrong

[Richie O]

If your fuel screw is all the way in, you'd almost surely have run away, unless your throttle was indexed wrong

Not all pumps will. My 89 will, my 93 will not.

[oldestof11]

Hmmm... It seems that 93's have the hardest time hitting runaway. Both 93's I had didn't runaway even after I installed bigger injectors in the one...

[1arock]

With my old eyes and the fact that I can't get my head close enuff to really see the teeth It is really easy for me to mess up the throttle shaft indexing.
My fuel screw is turned all the way in on my 92 and it did not run away either.
Rocky

[Remps]

If you lengthen the fuel screw a bit they will run away. In a hurry too.

[Fred_M1010]

If your fuel screw is all the way in, you'd almost surely have run away, unless your throttle was indexed wrong

Not all pumps will. My 89 will, my 93 will not.

Not mine either and it's a 91.5
I doesn't even smoke very much.

Isn't the run away a "non-IC" thing?
Wasn't there a difference in pump or injectors on those trucks? (-89 to -91.0)

A friend of mine had a -89 D250, and it beat the snot out of my W250.
It's also got a much faster throttle response, and as far as we know it was completely stock except for the pump tuning.

[cmann250]

I hit runaway on my 89, so i don't know if it is a IC/nonIC thing. The theory seems to hold water, at least with the stock length full fuel screw.
And the nonIC trucks have bigger injectors (4x13?) than the IC'd trucks

[AHineman]

I hit runaway with my 93. Injector size has nothing to do with it.

[collegekid]

Mine did too and its a 92

[Mark Nixon]

Why do people prefer to use the method that ALLOWS the possibility of runaway in the first place?
Why do some people NOT remove the fuel screw BEFORE they take the top off the pump, running the risk of bending the fueling lever?

There's the risky way, then there's the proper way.

Adjusting the fuel screw without runaway is as simple as running the idle screw clear back, then turning the fuel screw in until it idles properly.
This totally eliminates ANY possibility of runaway.
With the way the pump is set up, you won't get any more fuel than that, without other modifications.

Mark.