ready to burn my truck

[JkC824]

Here is the problem, I am not getting any fuel from any of my tanks. I changed the fuel tank selector valve, relay, filiter, elec. pumps, selector switch in cab, relay on fire wall and put a new computer in it. The pumps will run if i run a hot wire to them but i still don't get fuel at the carb/fuel injectors. when i checked to see how many V i get at each tank its only .63 and that is the same at the switch in the cab. What could be the problem? Please someone help me!!! Thanks