I am lost on this. I have 2005 6.0 psd, would not start after driving to work, got it home, checked all fuses and relays, so i changed fuel pump, still no start, no codes, where do i go now. Besides insane!!??

 

Check basics, ficm, fuel pressure, oil level.

 

Check the low pressure oil by pulling the oil filter cap and holding just the filter down in the housing and have someone crank it over to see if the housing fills up with oil. it would be best to scan ICP actual pressure -ICP desired Pressur-IPR duty cycle. If the STC/snap to connect/ fitting has not been changed on the HPOP then that would be my first thought, when they fail the truck will normally start when cold because the oil is thick but you may notice longer crank times but when the oil gets hot it won't start because it cant' build pressure. when it gets bad enough the oil will actually drain out of the bad STC fitting and will take forever to build pressure if it even can.