I purchased this truck a few months ago. 2006 f250 6.0 240k. It was dealership maintained until I bought it. It belonged to a Gc and it was his truck very well taken care of. All the mods except egr delete. It was a Hot no start, it had a broken wire in the IPR pigtail, new motorcraft ipr and pigtail. Ran great for a few months. Always cranked right up. Last month my batteries died. Had it towed home replaced the batteries new motorcrafts. Only had about 150 - 175 on hpop, had sync. No codes. Air leak was under the Hpop itself I use a fitting in the ipr port. I could feel the air but couldn't actually see or feel the leak. A friend of mine(ford tech) said it was a bad Hpop. I also had an obvious hole in the bellows my uppipe (could also hear it before) so I ordered a new uppipe and a reman Hpop. Had a few leaky injector nipples so new orings on injectors and nipples. New motorcraft standpipes and dummy plugs just because I had them. Oil change, aftermarket oil filter same as I took off. (I've ordered a new motorcraft filter and cap)Now I have zero oil pressure. I have cranked it for days more than enough to see something. I've cranked it from the jumper watching the filter housing, no oil. There was nothing in the oil pressure relief valve, it wasn't stuck. So I'm looking at replacing the Lpop, I don't now what else it could be and I don't know why it gurgles from the reservoir area. Is there anything I've missed. Also air test still sounds the same as if its gurgling in the reservoir, not from the sides, really don't think its a branch tube, I really hope not. before it wasn't gurgling, just air. My ipr screen was clean didn't find anything that I shouldn't have in the oil. I'm a little frustrated. Any help would be greatly appreciated and welcomed. I guess my main question is would there be oil in the filter housing if the Hpop system won't pressurize? Is the engine dedicating the oil pressure to cranking?

 

Ok, first things first. ALWAYS use Ford filters on your 6.0 diesel. The taller aftermarket oil filters are known to cause problems. Second, who changed the HPOP and how did you know you had an up pipe leak? Would that be the STC fitting you are talking about instead? Third, do you have pics of where the oil leaks are? And forth, you might want to put this in the 6.0 diesel subsection. You will get a lot more responses there. B.

https://www.ford-trucks.com/forums/forum107/

 

I'll move it there thank you. My daughter had surgery so I've been ooc for a little while. The tubes I was referring to was the branch tubes. I had an obvious hole in the bellows of the uppipe. I just don't understand how the oil system works. Where ever it is leaking its a big leak. It's definitely coming from the hpop area. Hopefully I just did something stupid, like forget to tighten the stc fitting locknut. I had to take it out and adjust it about 6 times. The first time I used the jig. Evident when it blew out at some point in time it blew hard the fitting was up against the back of the engine. But before I removed the old HPOP it wasn't leaking. It had been upgraded. I did install a new STC fitting, hopefully I didn't tighten the lock nut. That would be the easiest fix. But I'm pretty sure I did. I could feel a little air moving under the oil rails but not anymore, all new orings. But now its gurgling from the HPOP area before I installed a new HPOP it was straight air. . I haven't touched it in over a week. But probably pulling the turbo and HPOP cover this evening.

 

And I have a new motorcraft filter and cover. I'll install that also. But I guess my main question is this, if there's a big HPOP leak will there be any oil in the filter housing? is the engine dedicating all the oil straight to the hpop system? If it isn't the STC fitting I'll make a video of what I see. I'm afraid its the branch tube on the drivers side. Thats really where it sounds like its coming from. I have a borescope thats should make it back there. I'm a certified tech just not a diesel tech. I'm also a retired inside machinist(Navy)

 

https://www.ford-trucks.com/forums/1...-no-start.html

Branch tube problems are rare.