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Hi my name is***** will be glad to try to help. What is the engine model and serial number? Also have you attempted to prime the fuel system?
Check your build date as your truck still may apply yo this bulletin. Click on this link.
2004-08 F650/750 One Fuel Tank Empty:Some trucks with dual tanks will have an empty right fuel tank and a full left tank. Diagnose by verifying power and ground to the tank transfer pump, and the fuel level sender input from both tanks to the transfer pump. Starting on 2004-07 trucks the engine runs off the right tank and the left tank feeds the right. Only the right sender is wired to the fuel gauge. On 2008 trucks the left tank feeds the engine, the right tank feeds the left tank, and the left sender is wired to the gauge. If needed, replace the tank transfer pump. TSB 05-5-11, 06-16-9, 07-9-2.If the fuel line elbow clips break, the elbow part number is *****