these are scans from the haynes manual. i didn't want to make the pics too big but hopefully you can read them
the pic shows how to bypass the relay...the context is to reprime the fuel system...but you could try to start the truck this way or at the least disconnect the fuel hose into a bucket while someone is turning the key to "ON" and see if gas is flowing
otherwise this pic shows how to test the relay to see if its bad