It sounds like you have no fuel pressure could be the pump could be fuel pressure sending unit it's definitely not pressurizing the fuel system. But on another note I would suggest unloading that truck asap! 5.4's are total flawed motor their an engineering nightmare! Ford got sued over that motor for how defected they are , spark plugs are an absolute horror , rockers bust maniflod cracks and breaks as early as 20k miles coill packs need changed their junk the entire motor is junk it's not if it will grenade it's when it will grenade it's 100% that that motor will fail