this may sound dumb, but have you checked the fuses? Had this happen to my old 96 and it was a fuse that turned out to be the fuel heating module. Check for blown fuses. good luck

 

Dont have to pull the motor to change the LPOP... just remove the belt, balancer and there is the LPOP... Not an easy thing to get to, but on a scale of 1 to 10... its about a 6...

 

Yes I have gone through and checked all my fuses. Everything is working fine but for the HPOP not getting oil... I would just like to know if there is anything else I can check because I wouldn't think a oil pump would go out like that and just quit? Thanks for your help guys.

 

We need an update on this!
I think this is where he is:
The LPOP isn't putting out any oil. He filled the HPOP reservoir and the truck started and ran for 5 or 10 seconds. The gauge on the dash indicated no oil pressure and the truck died after those few seconds. Then the reservoir was empty.
I feel that for it to fail somewhat suddenly that it would seem like the pressure regulator for the LPOP would have most likely failed. He is right though that for the past couple of weeks the truck ran poorly a few times so who knows. Maybe the LPOP failed and was getting weak near the end and was causing the truck to run poorly intermitently. I think we stated that the first time it ever missed a beat was just like you had shut off the key for half a second while driving and then moved it right back to the run position. It did that a coupld of times several weeks ago. Then the last two weeks it was running or so it would be running along fine and then start bucking and sputtering for a few seconds before clearing up and running fine again.
I wasn't sure what to tell him. Right now he is going to try a different filter base to see what that does. He was able to take his IPR and run it in another truck so it seems to be ok. From what he could find, the pressure regulator is built into the filter mount / base.
When I looked into the HPOP reservoir as he cranked it over, there was no oil flow into the reservoir. So, I don't know what to think. Maybe the LPOP has failed completely. Have any of you ever heard of this or experienced it? I told him I wouldn't think it would fail (In a healthy motor anyway.). I wonder what happened to the rest of the engine in all of this . . .

 

Hey guys. Sorry it had been so long. I just got back in town from vacation so now I am back to trying to fix my truck. I just got started on it today. We are positive from the other stuff we have checked out that it is something in the low pressure oil system that is wrong. So since it was the easiest I took the oil pump out today, everything on it looks fine, no excessive wear or anything that looks like it could cause it to stop working completely. So my next guess is the oil pickup tube. I am told that I may have to pull the cab and the engine to get the oil pan off to get to the pickup tube. What I am wondering is if anyone on here may have done this before? And if anyone has, what is the best way to get to the pickup tube? Thanks for all your help!

 

When was the last time you changed your oil. If the oil gets old it can cause problem with foaming and your hpop will act weird or quit working. Some times changing the oil dosnt get rid of all the problem and you need to put an anitfoam additive to the oil. You can get it at an international truck dealier

 

I didn't have more then 4000 miles on the oil. I know for a fact I had absolutely no low oil pressure. I even took the oil filter out and cranked the engine over and didn't get a drop of oil out of it.