isx will not start cranking low fuel pressure

[Chamberpains]

Your problem sounds like you had a bad lift pump and a fuse blown. Had you changed that then primed the system properly, your truck would've probably fired off. But, you changed the fuel filters after the lift pump dumped out a bunch of fuel, then the fuel filters being changed probably drained out the rest of the fuel. They become a real bear to start once fully drained.

What leads me to this, is you made no mention to the low fuel pressure code coming back after the lift pump replacement and Insite showed the gear pump working then. As it was making 150 psi (normal cranking psi) during cranking. Which lands the next reasoning of trapped air from when you drained the filters.

Thanks for the update. These surely help people.