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Maybe your fuel pump has lost it's prime. The suction side of the pump is notorious for leaking at the quick connectors and drawing air into the system.
Have you checked to see if there's fuel in the filter cannister?
You might try pressureizing your fuel tank with a shop vac on "blow" and see if you can get it to go.
Also your batteries may have drained far enough that your electroonics (PCM & IDM) have quit working. Try putting a good charge on the batteries.
Good luck.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, 6spd, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, Jody's 80 HP Econo PCM (classic version

), AIS,
coolant filter w/"hokum" bracket, regulated return,
heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check here