I was adjusting the high idle stop on my injector pump the other day, and when I fired it up I noticed fuel leaking out of the throttle shaft at first, but after a minute or two it stopped. Obviously this needs to be fixed, but how, does the pump need major dissasembly to fix this? Is there an o-ring in there or what? Any information would be great Thanks. Also when I turn the truck off, it doesn't just stop, it takes a few revolutions for it to completly die, and it shakes and shudders. Is the injector pump advanced too far, or not enough. Thanks again

 

A friend at a pump shop told me that when they start leaking at the throttle shaft they are usually ready to be freshened up inside. That's what happened to me and I just had him rebuild it, that was a few miles less than yours appears to have. I've read were some owners have done the repairs to the shaft themselves, but I think in the long run it will need some help anyway. I've always prefered to repair things on my terms not out in the boonies somewere

 

It takes about an hour for a pump shop to install the new updated throttle shaft bushing. Maybe 20 bucks for the part give or take and an hour for the job.

If you do decide to do this, have them check the fuel pin seal and the fuel solenoid. I just had a new fuel pin seal, throttle shaft bushing and top cover gasket installed. About 40 bucks worth of parts and about an 1 1/2 hours to do it. Sounds like the solenoid may be giving you fits when you kill the engine.

 

250K on my pump and it is running stong as ever. STronger, now actually. During a recent top end overhaul, I pulled my pump to repair the throttle shaft that was leaking and install the 3200 GSK. Once on the bench, it took me less than 2 hours to replace the throttle shaft, install the governor spring, replace the top cover gasket and replace the o-ring on the back side of the pump that is so prone to leaking.

about $50 worth of parts and a couple hours. It was well worth it. BTW, this was my first time ever into a injection pump so it is not like I am some kind of pump wiz. Anyone with the tools, a little machanical savy, and the patience can do it.

Carl

 

Thanks for the info, by the way, where did you get your parts, just a local pump shop?

 

I got mine from Wentland Diesel . I called a local pump shop and they did not know which pump was on the 5.9. They just gave the old there are 4 different pumps and they are all different. I called up Wentland and they had me my part the next day.

A C-clamp and a rigid block of wood works well for pressing the old bushing out and the new in.

I would also suggest getting the top cover gasket and the throttle shaft o-ring since you are going to be in that far. Do the GSK at that time too if so inclined.

Carl

 

GSK? is that the governor spring? I want the 3200 spring anyways.

 

Yes it is. That spring is gonna set ya back a whole nother $13.50!

Carl

 

Mine started leaking outta the back side closest to the engine and it cost me 700 bucks to get fixed something like a spring let go and took out a few nice pieces of the injection pump
DM01

 

Hi
First time for me on this forum. Just got back from inlaws yesterday puled into driveway and truck died. Pulled the fuel solinoid and found alot of metal chips cleaned and reinstalled but would not fire. so I called local pump shop they informed me a spring broke and its rebuild time. anyone know if the chips can get in the injectors?

 

Some very small chips can get into your injector and interfere with the needle valve seating but it is unlikely since your injector inlet port has a screen to keep any trash out that may go thru the system. However, if it does, you can very easily burn an engine up due to that cylinder overfueling. For piece of mind, I would advise you to get the injectors checked out. Especially if they are the stock OEM injectors. They will problably need the pop off pressure retuned since they due become different from each other over time.

 

It is also normal to find high mileage injectors flow more fuel.... seems the high mileage and fuel flow has a tendancy to "extrude" the nozzle holes a bit.... or so I'm told....

pb...

 

Thanks for the info

Took the injectors down to a local pump shop and had them tested and they were poping off early and some were driping. putting a rebuilt set today.