I think my hpop reservoir is draining out.

[dannyboy950]

I have to modify my normal position on this and say it could be.
Until recently I would have said NO but thanks to Bismic who put me intouch with another highly skilled and knowledgable mechanic who had conflicting exsperience.

We compared notes on test methods and results, both of us ran the same tests and used the same methods and got different results.
In my case it was a low pressure pump problem [pin hole in the pick up tube in the oil pan.
His turned out to be the hpop. This is a very rare condition I have only come across 1 since 2004 and he only reported 1.

In all fairness we really have too small a test sample to draw any definate conclusions.

Op all I can say is it could be, only extensive testing will tell for shure.

And bismic thanks for your assistance.


This was how I did my test

When the truck came in I jacked up the front 18” and set it on jack stands letting it sit for 12 hrs. Started it up the next day and it ran for a few minutes then started to sputter and died, unable to restart. Pulled the oil cooler and shure enough the resivoir was nearly dry. So I think maybe I was wrong but figured I would test further.
Leaving the cooler out I topped up the cavity and measured 5 in” of oil at the back of the cavity. Let it sit for 12 hrs and checked no oil loss, still at 5 in”. Removed half the oil and reinstalled the cooler. I disabled the truck so it couldn’t start, removed the filter and holding down the drain valve had a helper roll the engine over. Oil came into the housing slowly and spitting and had air bubbles.
Suspecting suction problems we then drained the oil and pulled the pan. Upon inspecting the pickup tube I found a pin hole in the tube where it met the bell of the screen. I surmised that when parked on the slope the oil would go to the back of the pan enough to lower the oil level to that point allowing it to suck air.
Repaired the leak reinstalled the pan filled everything back up and leaving it on the stands, re-enabled the engine and started the truck. After a few seconds of it purgeing air it started up and ran for ½ hour and I shut it down. Restarted it 10 times without problems.
Set the truck back down and released the truck. Never saw it again for that problem although 6 months later it was back because they ripped the rear axle from under the truck. Them boys was kinda hard on them field trucks LOL.
If you would give me the particulars of how you made your determination I would appreciate it.
While I have only recently joined a forum that you are a member of I have seen many of your posts as a guest and find you to be quite knowledgeable and respect your opinions.