Truck won't start and fuel pump stays on?

I have a 93 ford bronco (f150) and it will not start, the engine turns over fine but its not starting. when the key is turned to the run position the fuel pump you can hear primes, but it just keeps priming. usually it runs for 2 seconds and cuts off but not now. The truck was running fine and i went on a trip for 2 days got back and it would not start. I've changed the Fuel pump inertia switch, the fuel pump relay switch neither worked there. so thinking its an ignition problem i changed the ignition lock cylinder and the ignition switch. Still nothing after that. I've unplugged the computers the battery every sensor i believe(any visible anyway) trying to reset the computer and still nothing. i have really run out of options other than dropping my tank and changing the fuel pump itself, or assuming that something happened with the computer and it fried. I did try and pull codes the first day it didn't work but nothing happened. no system pass codes or error codes, nothing. im debating on changing plugs, plug wires and distributor and maybe coil out assuming maybe there isn't any spark, but i don't believe this would cause my pump to keep running trying to prime itself. please help me! thank you for reading all this sorry its so long.

wes