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Try this, turn on your key for 5 seconds or until you hear your fuel pump stop running. Then try it, if it stays running, your fuel filter is plugged or your pump is weak. This is a common problem with the Fords I have owned. By the way, I wait the 5 seconds. I'm too cheap to replace the fuel pump.
The fuel filter has been replaced already so that's not the problem.
The truck is being run off the front tank only.
The duel tank fuel selector valve is stuck in the front tank position, and with the rear in-tank pump in operation the main fuel pump will pull the fuel from the front tank, so the pumps are not a problem.