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Go to the wiring harness leading to the injecters. Check for power at the red and white wires. If they have no power, check the ECM1 fuse. If they do have power then check for pulse on the DkBlu and Dk Grn wires. If you have both power and pulse, then that only leaves the injecter or plug to it.
Here's the schematic to help you. Please click on the accept button after viewing..
As long as the truck has a good fuel pump relay.