With the fuel line disconnected, and routed to a container, and the ignition key turned on, by a helper, try hitting the bottom center of the tank with a rubber mallet.
This will sometimes jolt the pump back to life ; but the pump only gets power for about 20 secs. if the engine isn't started. If the pump will run doing this , then find and by-pass the fuel pump relay so the pump will run the fuel out.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.