Hello,

This is on my 93 6.5, but I figured this fit here better than the 6.5 section, being mechanical DB2 IP.

I'm adding a IC and a H1C Holset turbo, so I figured I could use some more fuel.

I took my spare pump, popped the cover and turned the adjusting screw 1/2 a turn where it felt like it bottomed out so I left it there(prolly where I messed up). I took the fuel inlet housing off, drilled and tapped to 1/4" pipe.

I'm running 3/8" line from the filter to the IP.

I install it on the engine, bleed the injectors, install the GP's, crank it up, runs kinda rough them starts to smooth out, I shut it off(no radiator). A couple hours later, crank it up again, runs rough a couple of seconds, smooths out good, seems to have good throttle response, I shut it off.

A couple hours later after buttoning everything up, I crank it up, just barely idles, wont take the fuel or rather not getting any, mash the accelerator it just barely idles up. A minute or so later it died, no fuel to the injectors.

I guess I snapped the shaft in the pump, haven't looked yet:mad:. So how did I kill this thing? Did I turn the screw to far? Is it getting to much fuel now that I went to the bigger fitting removing the restriction?

On my orriginal pump how far can I adjust the allen screw? I dont want to kill it also when I swap it back out, tomorrow night.

Sorry for all the questions.

Thanks,

How much PSI do you plan on having that turbo of yours putting out. With an IC, and better turbo, a half turn sounds right, although i am far from a expert. I would wait for someone more knowledgeable to post before you listen to me. However, i turned my pump a half turn, (J code pump on a 6.2) and it felt like it was as far as it was going, so i left it, and my truck runs good, just with a bit of smoke until the turbo spools up.:D

Also, correct me if i am wrong, but if you snapped your IP shaft wouldn't it not run at all?

Correct Detroit, it doesn't run anymore.

It just died like you turned the switch off. Now there's no fuel coming to the injectors, even though I have 15+psi to the IP, which is weird before I don't think I ever saw over 12-13psi before with the engine not running. I can also hear the solenoids click when I unplug the Ip wires.

I wasn't planning on running over 15psi on the stock short block, maybe one day I'll have an 18:1 engine that I can crank the boost up on.

Thanks,

Hello,

This is on my 93 6.5, but I figured this fit here better than the 6.5
I took my spare pump, popped the cover and turned the adjusting screw 1/2 a turn where it felt like it bottomed out so I left it there(prolly where I messed up). I took the fuel inlet housing off, drilled and tapped to 1/4" pipe.

I'm running 3/8" line from the filter to the IP.

I guess I snapped the shaft in the pump, haven't looked yet:mad:.

So how did I kill this thing? Did I turn the screw to far? Is it getting to much fuel now that I went to the bigger fitting removing the restriction?

On my orriginal pump how far can I adjust the allen screw? I dont want to kill it also when I swap it back out, tomorrow night.


You can't hurt the pump by bottoming the screw unless you force it and break it off. Pumps are usually sized to the engine where there's not much adjustment left anyway. Those that ARE turned way down below their max capacity often have limiting shims installed that stop you from turning up the fuel too much (unless someone removed them).

In regard to installing larger fuel line - I don't see where that can gain you anything. A 6.5 turbo turned way up - at max load - getting around 6 miles to the gallon is uses less than two quarts of fuel per minute - and with normal driving, a lot less.

You can turn the screw in too much and the adjustment leaf will flatten out and hit the cam lobes in the pump. Don't ask me how I know this.

I would be concerned with you drilling out the inlet to 1/4 inch. How did you re-install it? What torque?

You said this was your spare pump. How long has it been sitting up?

You can turn the screw in too much and the adjustment leaf will flatten out and hit the cam lobes in the pump. Don't ask me how I know this.

I would be concerned with you drilling out the inlet to 1/4 inch. How did you re-install it? What torque?

You said this was your spare pump. How long has it been sitting up?

What pump and what part # spring are you talking about? I've had hundreds of Stanadyne rotary pumps apart - Ds, DBs, DB2s, DCs, Cs ,DMs, CBs, etc. and never seen one yet that you could make the leaf-spring hit the cam-ring -not even close.

DieselPro, what is the torque spec for the inlet housing? I just snugged it up and tried to put it back where it was orriginaly.

Thanks,

I would be concerned with you drilling out the inlet to 1/4 inch. How did you re-install it? What torque?

You said this was your spare pump. How long has it been sitting up?

Would drilling and tapping the inlet to 1/4" pipe, with 3/8" hose barb and hose damage the pump by supplying to much fuel?

I got it from a friend, I dont know how long ago it was rebuilt, but it was sealed in a bag with all the plastic caps still in place. Probably 2 years or so old.

Maybe Sunday I'll get a chance to work on the it, I'll take it apart and see what it looks like.

Torque on the end cap is 30-35 ft. lbs. Extra fuel is not going to seize it. Lot's of other things can.

& jdemaris the one that hit the cam was a 4544 which a guy in the shop was trying to make it a 4911 output. (Make a 6.2 fit a 6.5TD.) He racked the screw all the way in and the leaf barely nicked the lobes. no damage was done.

Torque on the end cap is 30-35 ft. lbs. Extra fuel is not going to seize it. Lot's of other things can.

& jdemaris the one that hit the cam was a 4544 which a guy in the shop was trying to make it a 4911 output. (Make a 6.2 fit a 6.5TD.) He racked the screw all the way in and the leaf barely nicked the lobes. no damage was done.

Under normal circumstances, it should not be able to happen. Stanadyne designs them that way as long as parts are not mis-matched. I suppose a little bit of housing wear that allows a small degree of cam-ring wobble might allow it. Or a bad - or incorrect spring.

I've got a DB2 pump on my bench apart right now. I screwed the spring down as far as it can go - and it does not hit the cam-ring.

Years ago - when tractor pulling was just starting out and wasn't a high-tech business - we used to turn up many pumps for farmers to pull at county fairs. They all had Roosamaster/Stanadyne D series pumps and all got turned up as far as they could go. Never had one with a spring hitting the cam-ring - EXCEPT - we had a few that got custom larger springs put in - and we did have some trouble with them.

I ran a 4911 injection pump in a 18:1 6.5, fuel was set at max then backed off 1/8 turn. It would easily provide 20 psi of boost with a Rajay non wastegated turbo and egt's would easily climb to 1300 with a moderate load. It did run hard though:D