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Discussion Starter #1
Hi all, I'm just going to get straight to the question. I have the pump deadheaded with a guage, I just replaced the IPR and cannot get any high pressure, only able to see about 150 psi. I have seen threads where they say the hpop doesn't just go bad, so that leads me to believe it's something else. Please, any suggestions would be wonderful.

thanks!
 

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Make sure the oil level in crankcase is full as well as the HPOP res and the oil psi gauge on dash shows oil pressure. There could be debris in the IPR cavity even though you replaced IPR


To isolate the heads as a potential large leak: 1) Remove the line from the right head and cap with a suitable plug. 2) Remove the left-hand line and connect an oil pressure gauge capable of reading 3,000 psi or greater to it. 3) Crank the engine while watching the gauge for actual pressure. If the reading is low, the problem lies in the high-pressure pump or the IPR. But to determine which is the guilty culprit, you first need to replace the IPR to evaluate. If that doesn't correct it, the pump will need replacing.

IPR pump can go bad / not unherd of. Also I have seen where the HPOP was installed and the gear was not installed correctly and caused low HPOP
 

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Discussion Starter #3
The IPR is the second new IPR I have tried. The origanal was one with the edge filter, then I bought the first new IPR from the dealership, but that one had no edge filter. I didn't know the difference beween the two, but as I found out more I went ahead and bought one with the edge filter. No difference. With the pump already deadheaded, its got to be the pump, IPR or IPR related, I just don't what else to do.

oh btw, I can only here the injectors clicking when the ICP is disconnected.
 

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I have 3 of these OBS trucks and one had the same problem you have. I ended up replacing pump and problem solved. We deadheaded pump with gauge and sure enough could not get the pressure,replaced IPR and still no good. Replaced pump and good after that.
 

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Discussion Starter #5
Wow, thats not what I wanted to hear. Is there any other way to confirm a bad pump? Does anybody make a rebuild kit?
 

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I have heard they are kind of finicky to rebuild . My buddy Brian worked for international for 25 years and says he has rebuilt a few , but recomends just buying another .
 

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Terminator Engineering can not only rebuild your pump, but upgrade it to a 17* pump, if that's what you'd like to do. That's second hand info, that has been posted here a few times before. Cost wise... not sure.
 
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