HPOP oil pressure building slowly - Ford Powerstroke Diesel Forum
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Old 10-27-2013, 03:00 PM
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HPOP oil pressure building slowly

I had a loss of power recently, seemed to be a high pressure oil leak. I decided to change out the injector o-rings and found significant damage on one that could account for the power loss. The trouble I'm having now is, I'm trying to restart the truck and still having high pressure oil issues. A guage on the oil rail reads around 2400psi when the injectors are unplugged, but only rises off 0 after 20-30 seconds of cranking. I goes up pretty quickly when it does. With the injectors plugged in, the pressure keeps bouncing off 500. It gets up to 500, injectors fire, pressure drops, builds back up, injectors fire again, etc. Any ideas where I am loosing that oil, or what might be going on?

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Old 10-27-2013, 03:21 PM
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it can take a while to burp the air out of the system. It is good that you have a mechanical gauge to watch. How long have you been trying to start it for?
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Old 10-27-2013, 03:42 PM
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Shucks, tried off and on all day yesterday. Thought maybe I had damaged an o-ring installing, so I pulled the injectors back out and checked everything, cleaned IPR, refilled hp oil reservoir, and tried again just a few times today. Again, pressure builds to over 2000psi when injectors are not firing. Just won't get steadily over 500 when trying to start. Does that sound like air in the system?

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Old 10-27-2013, 06:51 PM
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somewhat but I am leaning towards other issues. Have a look at your ICP sensor. See if its got oil in the electrical plug
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Old 10-27-2013, 07:04 PM
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ICP was replaced a couple months ago after it started giving me problems; the new one is dry and seems fine. Also, I got similar results with it plugged in and with it unplugged.

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Old 10-28-2013, 04:21 AM
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Here are a couple of other observations: if I plug one outlet on the hpop and hook my guage up to the other, it still takes a while to build up pressure on cranking. The guage sits at 0 for 20-25 seconds, then moves pretty quickly up to about 3000, then falls back to around the 2200-2400 range. Id did manage to get the thing running on the driver's side bank with the passenger's side unplugged, and while idling on four cylinders the hpop pressure stayed right around 600 or so, just high enough to keep the thing running.

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Old 10-28-2013, 11:31 AM
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either your IPR may be a culprit or the HPOP itself may be the issue. Whilst cranking try tapping on the IPR and see if it helps at all
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Old 10-28-2013, 12:08 PM
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Yeah, I'm thinking the same. Pressure should show on the guage almost instantly when attached to the pump outlets. The fact that it consistently takes nearly a half-minute to build seems to indicate that one of those two items is at fault. Picking up a new IPR tonight. Will try just the solenoid first (already cleaned the existing unit). If that doesn't fix it I'm about ready to assume it's the pump itself. Funny thing is it ran fine until the injector o-ring failed...

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Old 10-28-2013, 04:01 PM
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o ring failure could have over run the HPOP
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Old 10-29-2013, 06:43 PM
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Does it cold start with a weak hpop?
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