high pressure pump 7.3 - Ford Powerstroke Diesel Forum
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Old 05-22-2013, 07:24 PM
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high pressure pump 7.3

I have been working on a 99 7.3 engine have replaced 2 high pressure pumps.Will crank and run when each one was first put own for a short time then will not oil pressure will only build to about 150 what could be causing this .I have never been stumped till this .
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Old 05-22-2013, 08:15 PM
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Do some research on the Injector Pressure Regulator (IPR), I have a strange feeling that could very well be your problem. Which oil pressure is building to 150? the low oil pressure, or the high oil pressure from your HPOP? Are you sure its an Oil issue? could easily be a fuel issue, or an electronics issue as well.

Originally Posted by heavy mechanic View Post
I have never been stumped till this.
Something is telling me this isn't the first, and most definitely will not be the last time you will be stumped!
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