There may be better ways to do this but a quick way is to pull one side of the fuel filter off and point it into a coffee can while someone turns the key on, don't start the truck, just turn the key to the ON position. If you don't get any fuel pumping out into the can, your fuel pump is not getting power or is shot completely.
If you do get a steady stream of fuel, then you can eliminate the fuel pump as the culprit.