Fuel pump is in the tank on this truck. There is also a fuel pump relay on the firewall. When you turn the key on, fuel pump should run for two seconds. Can you here the fuel pump with the key on?? You didn't mention what transmission, but if it has the TH400 it also has a relay on the firewall and I believe it is the same as the fuel pump relay, so you could try switching the two and see if that makes a difference.
Also, TBI fuel injectors only spray when engine is cranking. Maybe you could have an assistant to turn over engine while watching for injectors to spray fuel. If the pump runs and fuel sprays while cranking, my guess is the ignition module is bad, as that is very common on those trucks.
If you do not have fuel at the TBI, I would try turning engine over and pouring a little gas down the throttle body to see if it fires. If engine will fire/run when pouring gas down TBI, you can be fairly certain the ignition is good, and the problem most likely is fuel pump. You will need a repair manual for the truck, one that has the electrical diagrams to trace the wiring to the fuel tank, to make sure no wires are broken and you have power to sending unit.
Might check fuel filter, could be clogged up and need replaced.
Just a couple of ideas, hopefully this helps you get the truck running.
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