I have a 04 lb7. The injectors have been rebuilt with new steel lines the Cp3 pump rebuilt all new rubber lines . Primer head rebuilt. And plugged fuel pressure valve. 3 new FPR and 3 new FPS. I completed the return flow test 3 times all under 100 ml . What is making me crazy is my edge programmer will truck is cranking low fuel pressure. But when I check for codes there is on glow plug code. The battery’s are brand new. I have check the whole wiring harnesses all the grounds. I even removed all the snow plow wiring all the strobe lights. If it did not come with the truck I removed. If any one can help I’m game.