04 Ford Excursion 6.0 Died NEED HELP

[yarby]

I purchased this truck 3 months ago. Just made my third payment on it. Ok so I was driving the truck home and it had just made it to say 170 degrees and the oil pressure sensor in the dash fell to nothing thinking i had ran the truck out of oil I killed it. Checked the oil on the dipstick it was full. I pulled the truck home and let it set. Later that afternoon I went outside and tried to start the truck. It took me a little bit of cranking but she finally fired up. I drove the truck to the end of the culdisack something like 100 yds and on my way back the oil pressure gauge fell. So i drove back and parked it. The next day i cranked and cranked and cranked and finally it started right up. Again i drove it to the end of the cul-di-sack and on the way back the oil pressure gauge fell again but this time i was able to use the gas pedal to make the gauge go up stay for a second then fall, again I would push the pedal let off and the gauge would raise for a second then fall. Next day or two later I went outside and cranked and cranked and now no start. I have icp at greatest 40psi, battery 11.94, ficm 47.5-49 volt, icpr 15-85% while cranking. I have autoenginuity with the ford package i can use to get more info if needed. i need help as I think its the pump or the icpr mabe a leak but thats a lot of parts to just be throwing at a truck to make it run. I love my 6.0 excursion but its no good setting in the driveway dead. If you have any help I sure could use it. I need to also know as i have a setup to pressure test through the icp but i dont know excactly what i need to remove to find or listen for leaks. THanks for any help in advance!!

[Tuscany]

Sounds like a classic case of hpo leak with only 40 psi icp pressures. Also get them batteries out and on a charger before you kill your ficm.

[yarby]

What do you suggest to look for to find the leak. Does the 04 truck sticker build 01/04 have a good stc fitting or bad and should i look into the dummy plugs any suggestion

[Tuscany]

Yours doesn't have an stc fitting or standpipes or dummy plugs if the truck is a 01/04 build. To be completely honest I would have to say your suffering from a failing high pressure pump.

[yarby]

I do believe that I do have a late model 6 as the icp sensor is located on the right valve cover rather than under the turbo. If this is true do I have the STC fitting and the wavy style covers over the injectors. sorry for all the questions just trying to get as much info to make an educated guess and go for it after that. thanks again

[Tuscany]

I replied to your pm and yes you have the wavy style oil rails with standpipes and dummy plugs but no stc fitting as you still have the old style pressure pump. I also gave you directions on how to further diagnose this issue in the pm. Good luck and let me know of this helps.