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After replacing the oil cooler, the high pressure oil pump reservoir will be empty, it will take a considerable amount of cranking to refill it and pressure up the system, how long have you tried to start it?
You may have a fault fuel pump, I have seen numerous times where the pump will only pump air and not lift fuel from the tank. do you have access to a scan tool that can read sensor values, to check the ICP pressure?
How long have you cranked it over each time?
when I Have changed out an oil cooler or a high pressure pump on a 6.0l it usually takes 5 to 10 minutes of solid cranking to get the oil pressure up and fill the reservoir for the high pressure pump, when it starts does it fire and then die right away?
This sounds like a fuel problem, I would suggest checking the fuel pump pressure at the fuel filter housing, if it is continually pushing air the pump is defective and needs to be replaced.
Yes that would be good idea, but this requires a special hose and adapters that you hook up and watch for air bubbles. This could also be caused by one ore more injectors being bad and sticking, this allows combustion pressure to be pushed into the fuel system and aerate the fuel.
I will keep this chat open and will be here when you return, I will think about other things fro you to check while I wait.
No problem, when you are trying to start it is there any smoke from the exhaust?
It definitely sounds like a fuel delivery problem, and from you describing there is a lot of air in the system, I am pretty sure that is your problem.
I am online most days from 8:00 AM to 10;00 and then again from 3:00 to 9:00PM
Do you need more help?
Okay, I just thought I would check in with you, if there is no activity the question will get timed out.