Replaced HPOP, no start. - Ford Powerstroke Diesel Forum
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Old 06-20-2013, 05:33 AM
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Replaced HPOP, no start.

Hey guys, I thought I would post and see if you might be able to help me out with my no start problem.

I have an 01 7.3L with 200k miles. Recently the truck started running rough. I hooked up my scan tool (Snap-On Modis) and noticed the ICP pressure was fluctuating ~450psi to a little over 500 at idle. The IPR duty cycle while this was happening was really low, between 6% and 8%. I figured there must have been some restriction in the drain path for the oil in either the IPR or HPOP. The truck had no trouble restarting cold or hot.

I went ahead and bought a new HPOP and IPR. After I installed the parts I made sure to fill the HPOP reservoir with oil and charged the batteries fully. I expected to crank a while on this 7.3 to get the oil system primed, but now after 15 or so cranking attempts I can only get ICP pressure up to 30psi with the IPR duty cycle jumping to 75% There is still plenty of oil in the HPOP reservoir, I even pulled the ICP and there is oil in the rail. I just don't understand why it is taking so long to build pressure with a new HPOP and IPR.

This is the first time I have done a HPOP in a 7.3L; I have worked on plenty of 6.0's though and have never had this much trouble priming the high pressure oil system. Any help or words of advice would be greatly appreciated, thanks!
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Old 06-20-2013, 06:00 AM
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I'd try unplugging the ICP. It will give the computer a preset ICP pressure. Usually helps start after that kind of replacement. When you unplug the ICP, check for oil in the plug, which would indicate a faulty ICP. Just an idea.

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Old 06-21-2013, 08:37 AM
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*Update*

I called the HPOP supplier and they sent me a new HPOP, I installed it this morning and she fired up on my first round of cranking. The supplier is going to flow test the original one to verify if it was a bad pump or not. I'll keep you guys posted.
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Old 06-24-2013, 03:40 PM
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Care to say what kind of HPOP?
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