STC fitting replacement kit: 4C3Z-9B246-F
I am sure by now you realize there are no guarantees when you get advice. Internet troubleshooting is hard since only the owner is actually there looking and listening to the truck. Also, only the owner has the potential for knowing the truck's history. As you know, sometimes even the owner doesn't know the history .... and that makes it even harder still - like your botched IPR
wiring. Over the internet we had no way of even suggesting that you had botched wiring as a failure, although we did narrowed it down to advising you to test the wiring (or at least Jamie did IIRC
). I hadn't eliminated the STC fitting as a possibility in that thread, but it was clear you had ICP
issues and IMO
you always fix those before you tear into the engine more deeply.
So, where I am coming from .................
You have already done the standpipe and dummy plug updates. You have a new ICP
and a new IPR
. You have observed and listened to the injectors w/ the valve covers off in the prior troubleshooting.
Now you have evidence of a major leak in the high pressure system - again.
Assuming that it isn't a bad IPR
wiring AGAIN, and assuming the updated oil rail components were installed properly, it is now down to the STC fitting or the HPOP
You have the reliable type of HPOP
, but that said, they do fail occasionally. We have suggested already to air test and that is the only way to identify a failed HPOP
that I know of (other than buying the expensive block off tools and trying to see what dead-head pressure you can get to).
If you still have the old STC fitting, and it hasn't failed, it can fail catastrophically in the future and crack your rear cover and then engine comes out. The STC fitting should be replaced - period.
I would replace the STC fitting and then do the air test before putting everything back together. If the pump is bad, you should hear it from an empty oil filter bowl during that air test. Some here have heard it also from the turbo oil drain, but IMO
that is down the line a ways from the oil filter path. If you installed the new one-piece fitting (STC replacement fitting) wrong, you MIGHT be able to see bubbles or oil seeping from the fitting, but after replacing it, there really won't be much oil in it to leak out.
One thing I can't speak to is your tinnitus. I have it too (worse in the left ear), and I know how it can interfere w/ testing. You will just need to assess how big of an issue that is for this troubleshooting and get some help if it concerns you that you might miss something. A hose or automotive stethoscope helps a lot.
The only thing that has me concerned is that you installed a new IPR
and the screen was found to be pushed in after only a few months of driving. That possibly could point to the HPOP
. Thus, do the air testing.