When I pressurize the HPO system at the top of the j-tube with shop air, I get tons of air thru the pump and discharging from the HPOP intake (reservior). Does this mean my HPOP is shot? I got to this point because the truck died one day and will not start. Won't build more than 250 psi (AE monitored). Prior to this it had starting issues where it would fire, run for a second and die. Then after 2-3 times extended cranking it would run (rough). No power until warmed up. Probably multiple issues working here......but I want to at least get it running again so I can sort out the lack of power and rough running (injectors.....stiction.....etc). Thanks guys.