I can't say with certainty that will be your problem, but from what you've done so far, it sounds like that would be your issue. (Since you previously stated you had fuel pressure while powering the pump externally, I assume you have no blockage in line and spray at injectors because that is the normal place to check that you have fuel to engine)
If I'm correct and you've determined the rest of fuel system to be good, then your issue must be with the ground somewhere. But since I currently don't have access and can't locate a diagram of your specific truck, I can't tell you exactly where to check other than on the ground side of the circuit.
Tuesday, February 8th, 2011 AT 10:58 PM