I have a leaky injector pump (sounds like that should be no surprise) that I need to replace. I am looking for a used or rebuilt model. My question is, do I have to stick with the same model IP? I read somewhere that someone installed a heavy duty model and it sounded like many models are interchangable. Is that the case? If so, are there any particular models to look for or stay away from?

Thanks

There have been several different internal parts and calibration changes and updates to 6.2 (I assume thats what you have) pumps over the years. There's just a few main categories from a calibration aspect to keep in mind. Older pumps will deliver fuel at 4000+ RPM, and thus the transmission is calibrated for an engine that is capable of these speeds, later models reach governor cut off before 3900, so if you put one of these on an older truck, tranny shifts will be out of sync. Tell me a little about your truck, like year model, 1500, 2500, auto/manual, stuff like that and I can look up what pump you have and give you a model number that would be a good compatible upgrade for you.

My truck is a 86 C10 Suburban, with the 6.2L and auto transmission.

The numbers that I was able to read off the IP last night are:
on a sticker (part #?) 540400
on the plate Standyne 4502, J, 23500400

So, I guess it would be the DB2 4502 model. Would any of the other models be compatable with my tranny?

I was thinking ablout taking my chance on finding an IP on e-bay (1/3 of the price). I just don't know if I will be able find the right model. I want to find out if I'd be better off sucking it up and shelling out for a fresh rebuild from usdieselparts.com or someone. Any input will be GREATLY appreciated. Thanks

DB2 829 - 4502, OK, I'm not super familiar with that model off the top of my head, I think a 4790 is going to be the updated HD model, let me review the test specs and get back to you.

Go to shop that rebuilds injection pumps and they can tell you the latest pump that you should use as a replacement. I put in a heavy duty pump when my original DP2 pump failed. The heavy duty pump was built for the J engines that did not have an EGR. I removed my EGR plus the butterfly in the left exhaust manifold. I also put in solid gaskets for the intake manifold to the heads. I cut the mounting bracket off the EGR and then welded a plate in resultant hole in the mounting bracket. In essence, my engine is now a J engine.

Usually the leak is in the throttle shaft seals - one on each side of the pump.

Could also be the mech advance rod seal, lower passenger-side.

Fairly simple procedure to replace, even with IP on engine........

Could even be loose rubber in\out hoses - tighten hose clamps to fix.

Personally, I'd take TDG up on his offer - two rebuilds for ~hunnerd bucks + shipping......

What was TDG's offer on rebuilds??? Otherwise, I would love to learn more about replacing the seals - where to buy them and how to replace them.

Hmmmm......I may be confusing your post with the Olds Diesel post - DB2 with different driveshaft and stuff - a red-headed step-child in the GM and Stanadyne families.

sbt........

GMCTD- how about that 'red-headed stepchild's little brother, the 4.3L diesel. *blah*

Fry Guy- Can't take the pump apart, replace the seals and expect calibration to remain intact...if its leaking, high mileage, you need a gasket kit, atleast the normal repair parts and recalibration, in short, a rebuild.

The DB2-4502 is the light duty pump. The upgrade to that is the DB2-4544 which was the heavy duty version with slightly more fuel and more advance. Install the heavy duty intake which has no EGR and you should be on your way. You can buy a kit from your local fuel injection shop. P/N 24370

Surely you wouldn't reccomend that someone attempt to install a gasket kit in their pump in their garage. I wouldnt even try that. He needs to have it rebuilt and recalibrated to 4544 specs to make it work properly.

I bite the bullet and bought a rebuilt 4502 from us diesel last week. I think it should be worth the money. I appreciate all the advise. Thanks

GMCTD- how about that 'red-headed stepchild's little brother, the 4.3L diesel. *blah*

Fry Guy- Can't take the pump apart, replace the seals and expect calibration to remain intact...if its leaking, high mileage, you need a gasket kit, atleast the normal repair parts and recalibration, in short, a rebuild.
Hey, wwe have one of those around here, still going. i wish the damn thing would die. belongs to a guy here ex-wife. We get stuck working on it.

Surely you wouldn't reccomend that someone attempt to install a gasket kit in their pump in their garage. I wouldnt even try that. He needs to have it rebuilt and recalibrated to 4544 specs to make it work properly.
reccomend, NO. seen it done before, yes.
We had an employee a few years back (4 or 5) and kits were coming up missing. Then he gets calls at the shop, seems he has been build DB2's and DBa's in his garage on the weekends, using our parts!
Thje calls were other people wanting him to do work for them, strangely I never heard of any comebacks from his garage jobs.

Installing the throttle shaft and advance-rod seals is not a big deal - remove the intake manifold and get after it.

Entire o-ring and seal kit would be another matter, indeed.

And, no - I am not the above mentioned ex-employee............;)