Pump mods help?

[mykal41]

Need More Power (pump Modifications?)

I would like to do the pump mods on my 89. Dos anyone know were I can get instructions. I would also like to grind my fuel pin and advance my pump timming. Any info would help.

 

[sparks57]

Here is some good info you should read.



https://www.turbodieselregister.com/forums/showthread.php?t=73761



I would just rotate your stock pin to the steepest side first and try that before you grind anything, and then turn your fuel screw in a couple turns. I'd also advance your timing to 16-17*.



A couple of things you need to remember when adjusting the pump:



*There is such a thing as too much bottom end fuel. Don't go crazy with the starwheel! If you give your truck lots of fuel on the bottom you will "overfuel" and cause more lag. Only add fuel where you need it, and just enough to get what you want. You will spend considerable time tuning to get proper fuel curves and egt's.



*Turning up the pump will degrade it's lifespan a little.



*Be carefull when pushing fueling to it's limits. A pump with a fuel screw turned way in may want to "run away". When making pump adjustments, keep a board around to cover the front of your turbo to kill the engine in the event of a runaway.



Others will probably add more.

 

[Niki]

Here is some good info you should read.



https://www.turbodieselregister.com/forums/showthread.php?t=73761



.

Where do you point the steepest side of the fuel pin? Towards the front of the truck? Is there any index pin or anything you can drop while taking the afc cover/pump top off? I'm about to put the pump top back on my auto and didn't mark the AFC diaphram when I took it off so I have no reference point.

 

[Greenleaf]

The control cone profile is pointed front. There is the cone w/rubber diaphram, the spring and the nylon washer. Providing you haven't gutted the afc. The star wheel isn't generally removed so it aint going no wheres. The top cover has to have the air port towards the back, again providing it's still used... ... ... .....

 

[sparks57]

When you remove the cone, and look down inside the shaft it was sitting, you will see a pin. It's on the side closest the radiator. It extenends and retracts following the curve of the fuel pin.



So if you put the steepest side pointing forward as compared to the truck, then you will be using that side.

 

[Highfinance97]

I would like to do the pump mods on my 89. Dos anyone know were I can get instructions. I would also like to grind my fuel pin and advance my pump timming. Any info would help.

if you can get a hold of TDR issue 42 pages 30-36 its also in there



Michael

 

[mykal41]

Thanks for all the info. I made the modifications last night and its like a new truck. Alot of bottom end. Now if I could just find out were to get some govorner springs!!!!!