[yanni1474]

Truck will not start unless oil temp ia around 155.Inj press is 325 when cranking.Already done the ger block off kit,truck runs 110% better when running.:

 

[ajpu1983]

You've got a high pressure oil leak. What year truck? Could be crankcase to head tubes, Injector seals, HPOP quick connect fitting, or HPOP itself. Once the oil gets hot and thinner it loses prime and won't build pressure once you turn it off. You can put shop air into the ICP sensor port while you energize the IPR valve and check for air leaks to pinpoint the area with the leak. Smaller leaks still may be hard to find without looking.

 

[yanni1474]

It's an o6 f-450.

 

[ajpu1983]

06s are bad about having blown O-rings on the oil rails. I've replaced a good many on that year model. Still should run the above test to find the leak.