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Will the truck start and stay running if you spray starter fluid in the throttle.If it does than the check valve in the pump is bad and not holding pressure in the fuel line for start up. You can also check that by cycling th e key 5 or 6 times from off to run slowly and letting it stay in run for 3 ro 4 seconds before going to off.if is a valve issue the pump should prime doing that and the truck should start.If it does than you need a pump.If it doesn't than check for power at the inertia switch if you have power there when cranking than you either a bad pump or no voltage from the switch to the pump. 99% of the time if you have power at the switch you will have power at the pump.