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Do you have a good ground to the FPDM at pin #3 (blue/gray ) wire?
The Blue/Gray wire at FPDM (pin 3)is the dedicated ground for the FPDM, grounding to the driver side of the frame at G401, near the carbon canister. Have you check it to see if the connection is clean and tight at the frame?
Okay dose the fuel pump now engage with the key on and engine cranking?
Okay you are going to need to go back and recheck the circuit to the FPDM and out of it to the fuel pump. I have enclosed the steps in the link below so you can do this.https://dl.dropboxusercontent.com/u/104923897/Fuel%20pump%20Apr%2017.pdfAlso see the Fuel pump wiring diagrams for testing reference in these link. Have a look and see if this will help you get this resolved.https://dl.dropboxusercontent.com/u/104923897/FP%201%20Apr%2017.pdfhttps://dl.dropboxusercontent.com/u/104923897/FP%202%20Apr%2017.pdf
That power come from the fuel pump relay so yes the key dose need to be on So if you have power now then your okay on that wire.
Are you sure you do not have a defect FPDM?
If you have power and ground into it then there really is not other reason why it will not turn the pump . I would run back through the steps once more just to be sure you did not overlook something.
The yellow/green id the power feed to the pump out of the FPDM and the ground.See the fuel gauge circuit in the link below. The sending unit wires at the pump are the yellow/violet and the green/blue.https://dl.dropboxusercontent.com/u/104923897/Fuel%20sender%20Apr%2017.pdf
The code P0462 indicates a problem with the fuel gauge and or the sending unit and dose not affect the Fuel pump or the driver module.
On your F 250 its located in the under hood panel. See the diagram in the link below.https://dl.dropboxusercontent.com/u/104923897/fuel%20pump%20relay%20APR%2017.pdf
The sending unit wires are the green/brown (signal return) and the yellow /violet signal out. In most cases this code you are getting set due to a failed fuel tank sending unit.
The signal in ware will have a low voltage reading.See the pinpoint test steps in the link below. Start your testing at test A 1.https://dl.dropboxusercontent.com/u/104923897/Pinpoint%20test%20A%20Apr%2017.pdf
That in most cases means the sending unit has failed.
You can just replace the sending unit.
You can also check the resistance reading on it as well to verify it has failed. . The sending unit should indicate a reading of between 10 ohms (full tank) and 180 ohms (empty tank). If the resistance is out of range low or high, replace the sending unit assembly.