HPOP ??'s
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Elder User
Joined: Sep 2007
Posts: 895
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From: Lenhartsville PA
HPOP ??'s
Does the oil in the HPOP need to be changed at times!! And how often shoud you check the level in it? I got 93,000 mi. on my 2001 F250 and never checked or changed the oil in the HPOP.. Any advice would be helpfull.. Thank's 
Thread Starter
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Elder User
Joined: Sep 2007
Posts: 895
Likes: 0
From: Lenhartsville PA
Thanks, My truck runs rough, almost like a miss between 1000 and 1500 rpm's holding the throttle steady, no codes. Just wondering If that had something to do with it. Other wise it's fine.
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
Nope, how it works is that oil is fed from the main pump into a pressurized reservoir to the pump, it goes through hoses into the cylinder heads (rails), then once the injectors use the oil they discharge the oil into the open area under the valve covers. Then the oil returns to the sump.
Elder User
Joined: May 2003
Posts: 650
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From: Leesburg, NJ
I had a problem with my HPOP a few weeks ago. It lost its prime and the truck wouldn't start. Take out the plug on top (allen key) and dip down in the hole. It should be 3/4" from the top. As it gets low, it can run the truck rough.
If it's not that, try a HPX line from rail to rail. It smoothed out my idle and low rpm's.
If it's not that, try a HPX line from rail to rail. It smoothed out my idle and low rpm's.
