Agreed. Should have made a huge mess at 700 PSI.

Even with an injector stuck open, I would think you would get a little more oil shooting out of the ICP sensor hole than that. But if you wanted to check for a stuck open injector you could pop off the valve cover on whichever side you're working on and you would clearly see the oil shooting out of the open injector.

But of course obviously that is not our issue. You took the lines off and didn't get any oil pressure out of the lines themselves coming directly off the pump. And at the same time you say the reservoir is full of oil? Did you fill the reservoir with oil manually or did it fill itself from the LPOP? If it's getting good flow From LPOP to the reservoir, then that is quite odd.

Shortly after cranking with the lines off, so directly after turning the key for a couple of cycles or whatever, did you immediately check the HPOP reservoir to see if maybe got starved dry? It's seeming like you either have a oil delivery to reservoir issue or a hpop issue.

After you go through that then purging air from the HPOP would be next. Just got to make sure you have good oil flow to it first from the LPOP.

This is quite interesting 🤔

 

I did fill the reservoir myself when i got the new pump. I also sucked it dry and cranked it over to see if it would fill itself and it did just after a few cranks. When i took the lines off and cranked it the reservoir was still full after and it's always been full, ive also cleaned the reservoir and screen.

 

not for sure, if its an open system it wont build pressure to shoot oil all over at 700psi

 

So you've established lpop pressure, and you are getting the reservoir for the hpop filled by the lpop but not getting pressure out the other side of the hpop. I know you said you checked all of the wiring for all the sensors and ohmed everything out, did you also check everything for the ipr? I would think if there was something wrong with the IPR wiring then your IPR percentage would jump around a little more but who knows. Clog in the ports that feed from the reservoir to the hpop? That could explain why even with the new pump you're not getting any pressure and limited amounts of oil. Lack of flow to the hpop. With a new hpop and a full hpop reservoir, it should be pumping oil out the other side as you obviously already know.

This could be a messy test as well but, if you take the IPR out of the hpop with the hpop reservoir full of oil, it should start draining the reservoir. Or at least some oil should come out. If not then there's got to be a clog from A to b.

I could be wrong about that a little bit because it might not drain the reservoir by removing the ipr due to the pump mechanism blocking the hole. But nonetheless you should definitely get some oil coming out. Now if you take the IPR out and crank the motor over some to get the hpop turning it will definitely start draining the oil out of the reservoir quickly and make a mess if you're getting flow to the hpop. Not 100% sure that would be a wise test to do or not because I'm not sure how the electrical system of the truck will act without a IPR plugged in. But that is probably how I would go about doing it in that ****ty-wation.

All in all it really sounds like there's a clog in one of the ports from the reservoir to the hpop. At the current moment that's the best I can come up with.

 

Ive had the reservoir apart to clean the screen and put new seals in, It's as clean as can be and there was nothing in the screen either.. I got a ipr tool i just havent had time to mess with it the past 2 days ill get to it monday and see what i can figure out..

 

Anything that can dump a gallon of oil through just one little hole in one 3/8 hose in under a minute is violent and messy in my book. The reason the pump is so good at what it does is volume it's capable of moving, doesn't have to have pressure to be violent and messy.

 

Dad’s fitting for the HPOP hose was bad during a hose replacement… and I didn’t know it. Thought for sure I had it snapped in place. After like 3 times of it popping off while cranking the engine and shooting oil everywhere I figured it out. It wouldn’t really snap so no “real” pressure. But it did shoot all over the fender very quickly.

I feel like if the OP has an open HPO circuit the oil should be moving out of it in a hurry.

 

lol, i use JIC fittings and lines now.. haven't used a stock fitting and line in year's

 

Gotcha, let us know how that IPR tool works out. I feel like with a brand new IPR you wouldn't have any issues but, it's not unheard of and there still could be wiring problems to the IPR causing all of this. Keep us up to date and good luck.

 

I did get a new IPR and also tried another wiring harness..nothing

 

Even with the IPR disconnected a mediocre pump should manage 100# or so. I can neither confirm nor deny the circumstances involved in how I know that, but do know it to be fact. Only 3 things I can think of that could cause 0 psi at the discharge. Air locked, no feed, or the pump isn't actually turning. Disconnecting either hose can rule out 2 of them. If oil will freely gravity from the reservoir through the pump and out a hose all on it's own, then it isn't air locked and it is being fed.

 

That's along the lines of what I was thinking by taking out the IPR. It should flow freely from the reservoir out the IPR hole if not clogged or air locked. But I feel like taking out the IPR is a lower point so it might be a easier path for the oil to flow out. I agree with you, those are the only things that make sense. Other than that I'm not sure.

 

I took the cover off to verify the gear is turning and like stated before i took the lines off and cranked about a quart from each line.. low pressure but still came out and reservoir was never low while doing it

 

But will it freely flow without cranking? I know it sounds stupid, but there is a difference. I've seen plunger pumps get so hot they crack their ceramic plungers, all from air trapped in the fluid head. They'll kind of act like they're working but just can't manage to make much pressure. You'll crack the discharge and get some fluid so ya think can't be air locked. Shut it down and and open the discharge and it belches a big air pocket. Fire it up and all back to normal. This may or may not be your troubles idk, just trying to mansplain my point I guess.

 

It will tricle out when not running but it's traveling uphill so can't imagine it flowing a lot not running..