Hello, first timer here! Need some help 2003 lb7 all stock but does have fass150 lift pump installed by previous owner. Today I went to start the truck a and it fired for a second then shut off. Checked for codes none present. Data list shows 3500-3800 rail pressure while cranking over. I know I'm going to get the don't do that but I disconnected the glow plugs and hit it with ether and she fired but still won't run. With no codes not sure where to go next