CHEVROLET OTHER FUEL PRESSURE

I Have A 2004 Dura Max 6.5 Deisel With The Allison Trans. I Can Not Get It To Hold Its Fuel Prime, Ive Changed Out The Fuel Filter With...

1997 1500 5.0 (m) 2wd.I've Already Replaced Fuel Pump, Cap, Rotor, Plugs, Wires, Module, Csfi Module, Fuel Filter, Pick Up Coil...

Changed Plugs, Wires, Cap, Rotor. Fuel Pressure Is 55pds. The Engine Still Does This Dieseling Under Load.