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Discussion Starter #1
I have a situation of no start that I narrowed down to no oil at the outlet of the HPOP (Please refer to my last post if you need more details). As per my last post, Here is where I am right now:

- There is no oil in the high pressure system and I am not sure why. I checked the primary engine oil and it's good since there is oil flowing to the turbo inlet ( I hooked the line and cranked until oil came out) and at the filter. I also had a hose at the ICP connection open to a small container and there was no oil coming while cranking. Assuming that the pump is good from how it looks and rotate, what could cause the no oil in the hpo rail? Or what would cause the oil not to get to the HPOP when the engine oil pressure is good?

-The other conclusion I have is the pump is bust even if it rotates and sounds fine. I would like to be able to test the HPOP to prove that it's either good or bad before spending the money on a new pump. Unfortunately, I have not found a shop that can do that yet. Please note that I am in Calgary Canada so I may not have access to the same options you have in the states.

Any suggestions on how to check if the oil is getting to the HPOP inlet to confirm that the pump is bad?

Thanks a lot for any input/help.
 

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Master BS'er
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There really is no way to test the pump, Not easily anyway. You could pull the ipr and see is oil flows from there. You can be almost certain that it is, since it's getting to the turbo though.

You could ground the ipr and see if it starts. Or do an air test.

It's either a leak, a bad pump or bad ipr.
 

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Discussion Starter #4
There really is no way to test the pump, Not easily anyway. You could pull the ipr and see is oil flows from there. You can be almost certain that it is, since it's getting to the turbo though.

You could ground the ipr and see if it starts. Or do an air test.

It's either a leak, a bad pump or bad ipr.
I done all the air test and I have no leaks even at 150 psi. Besides even a leak i the high pressure side of the HPOP, or a bad IPR, I should see oil in the high pressure rail even if the pressure is not enough to start. I had a hard start before and I changed my standpipes and it works fine.

My main question in this thread is why I either I am not getting oil to the pump or may be the pump is bad and it's massively leaking back to the crankcase?.

By the way my truck is a F250 2006.
 

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"resident smarty pants"
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The only time I have seen this is when an HPOP was replaced and the suction opening plug was not removed before the install.

Are you sure that the standpipe on the ICP sensor side has not failed and completely plugged it up? Not sure if that is even possible, but just brainstorming. To test that, you could leave the IPR valve out and take a couplee of cranks (messy I know, but it might tell you something). Another option would be to remove the passenger valve cover, remove the standpipe, and see if you got oil flow from it when cranking.

An aftermarket cap and an OEM filter can starve the HPOP by leaving the oil filter canister drain valve open, but to cause zero pressure would be quite unusual.

I suppose a blown HPOP inlet gasket could leak quite a bit, but enough to cause zero pressure? Not real likely IMO.

It may be time to open it up I would think. Make sure the pathway from the oil cooler sump to the HPOP is clear.
 

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"resident smarty pants"
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Updates?
 

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Discussion Starter #7
Sorry for not providing any updates as it took me some times to find help to diagnose the HPOP.
I finally had the HPOP checked by a good diesel mechanic and, from the way it rotate, he believes the pump is bust. I ordered an Alliant one as well as a seal kit for the turbo lines and the IPR from Riffraff diesel. will update as soon as I will receive and install.
 

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Discussion Starter #8
Sorry for not providing any updates as it took me some times to find help to diagnose the HPOP.
I finally had the HPOP checked by a good diesel mechanic and, from the way it rotate, he believes the pump is bust. I ordered an Alliant one as well as a seal kit for the turbo lines and the IPR from Riffraff diesel. will update as soon as I will receive and install.
Just received the HPOP this morning and it's installed and the engine start.
I am going to do some check with the scan tool to see if everythng id good and test drive and hopefully this problem is finally solved!
 

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"resident smarty pants"
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Thanks for the update. Glad you got it running. Not real common for the 05 and up pumps to go bad, but clearly it happens.
 

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Discussion Starter #10
Thanks for the update. Glad you got it running. Not real common for the 05 and up pumps to go bad, but clearly it happens.
Just did a last check and everything is good. I was surprised that the pump failed too but I guess there is always the exception!
Thanks Bismic1 for you help and insight.
 
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