Have you checked to be sure fuel is getting to the pump? It may take a little time to siphon the gas out of the tank and fill the lines and the pump. Try slightly opening the pump inlet line and start the truck using gas in the carb. This will purge air in the line and possibly get you going. A little messy though so be careful. I assume your gas is not fed out of the bottom of the tank thru a petcock that may be closed but out of the top of the tank where the sending unit is.
