So I have a late 98 24v POS, other than the vp44, I like the truck. But vp#2 just went on me. 10k on the first one, (bad lift pump, had truck less than a month) and ~65k on the latest one. I never recall loosing fuel pressure. The first pump I would have bought a blue chip pump, but I was 1k miles from home, and had to have the truck running in 24 hours. Anyway, truck is either getting tossed, or converted to Ppump 7100. Ive got a 96 12v truck found, for most of the parts, then part out the rest of it.

What Im looking for is people who have actually done this swap. Looking like I need aftermarket injection lines, an oil supply line to the pump, respring the 24v injectors, etc. Pretty much lines, and the donor truck gets in 99% there. Anything else I should know?


Thinking at the time, get a new 7100 pump, turned up a little, and bigger injectors. Not a play truck (it is a dually) so it gets used for hauling weight, up to ~14k, and periodically a 2 place car trailer, over the rockies. I DO NOT want to have to worry about cooking the thing, though I do already have boost amd pyro gauges on it anyway. But I want to go to sleep and not have to worry about someone not familar with diesels, and pyro's trying to explain to them what EGT's are. Just get in, drive, Im going to sleep now.

So who has ACTUALLY done this conversion?

 

My first question would be, are you sure those pumps were bad. I sat in the local Bosch repair center here a few years ago and the guy showed me around the facility. They had a stack of VP44's waiting for rebuild that had nothin wrong with them. guy's thought they were bad and replaced them, the cores ended up at the repair center in perfect working condition.

According to the manager that was with me the number one reason for this was the return line regulator. It's just a simple banjo bolt with a spring and bearing in it that maintains internal pressure on the pump. It goes bad and the pump can't maintain the right pressure on so for cost of this one bolt a $1000 pump is replaced for no reason.

We just saw in another thread here today that a guy changed pumps out only to find out the problem was a bad relay in the fuse box.

Don't know if any of this was applicable in your case or not but these pumps get a very bad rap that is undeserved for lack of us not checking the details. The only way to know if a pump is bad is to have it tested at an authorized Bosch Service center. Other then that it's just a guess.

 

Yea i deff. have to say check that relay LOL but yea deff. make sure that pump is good or bad 1000 bucks is alot of money to some if not all people in these hard times. but good luck with your swap and if you decide to do it make a documentery sorry bout spellling but yea it would be a really good one to post on here and in the future you could help alot of guys/gals out

 

new return bolt as of ~ a year ago. This time, exact same symptoms as the last pump. Planning to keep th etruck a good while longer, and sick of dealing with this POS issue. swap to 7100, tweak a few things, and put another 300k on it from there.

 

know we have a few members who have done this but I don't know if they spend they're time in the 12V or 24V sections, so I'll move to the General Cummins Section to be sure they all see it.

I know we've had several threads on this issue through the last few years so you , may also have some luck with a search.

 

I am by no means telling you that this site can not answer your questions but if you follow the below link you will find a wealth of information on a P-Pump 24V.

P-Pump 24Valve - Competition Diesel.Com - Bringing The BEST Together

 

You either have something going on with your truck or you got some bad VP44's. A good VP44 with the correct fuel pressure is good for 100K + miles.