Hi Steve, I have replaced HPOP, stand pipes, dummy Plugs, trucjk starts great when cold, won't start at all when hot. ICP-DSD 4000kpa and ICP Actual is 2500kpa when hot, What can my problem be, thanks
Boe

Depending upon mileage, a worn and tired fuel pump could be the problem. Tolerances increase and fuel pressure drops, when it gets hot.