I am unsure of what is wrong, story is i am helping someone fix their 97 e250 with the 7.3 powerstroke. I Plugged in my scanner and am not getting more than about 140psi in the hpop. He told me he replaced the ipr the icp and the cps. I tried unplugging the icp and still nothing. duty cycle is at 67.5 or something in that range (was 60 something i dont remember exactly) I am left thinking that it is the hpop itself or even the pcm. i pulled the valve covers looking for oil being pushed out from orings(he also replaced) or a stuck poppet and saw no oil coming out of anywhere.

a buzz test yielded code p1294 but all injectors buzzed. the UCH was all together and everything as well. I am at a loss, can someone please point me in the right direction?

I can get a 2001 HPOP, would that work on the 97? i know they have different angled something..

 

Is the 140psi cranking speed or idling because it takes 500psi just to start? Duty cycle should be about 12 at idle. A 2001 is a little better then the 97 but these hpop's hardly ever go bad.

 

It's 140 cranking. It won't start. Also cranking somewhere between 100 and 150 rpms

 

The pump is dead or you have a major HPO leak on the injector orings

 

It doesn't appear to be the injectors. Wouldn't the same pressure be accomplished with the ipr stuck open?

 

I can tell you mine with a new ipr and new icp will see 3400psi cranking over (usually when cold since a few glow plugs are dead) ipr duty is around 55 to 65%. Will it start with icp unplugged? I'd say hpop is bad or lpop

 

No. It doesn't start no matter what. I think it was an aftermarket ipr

 

Is there oil in the HPOP reservoir? I had a mysterious no start condition once and discovered that the HPOP level was somehow unexplainably low. Filled it and it's been fine ever since. Just a shot in the dark but it's always good to check the simple stuff.

 

is crank case full?
Are you parked at an angle aka nose is up?
what is low pressure oil?

 

did you get the hpop from the 2001

 

There is quite a few places that low hpo can be caused by. It seems surprising that the hpop would just up and quit. But it has happened before. Places I would start are ensuring the hpop reservoir is full, icp and ipr pigtails are in good condition and properly connected, the tin nut is tightened onto the ipr, if that's all good I would investigation the wiring harness that goes under the fuel bowl. Also is he sure that the ipr orings didn't get damaged or rolled upon instalation?