Some 2011 Ford F-350 vehicles built on or before 11-1-2010 may exhibit an audible clicking noise in the engine compartment and/or hard starting after refueling, with DTC P0144A, P0171, P0174, P0316 and/or P1450.
The problem may be the EVAP purge valve.
1. Does the vehicle exhibit an audible clicking noise in the engine compartment?
2. Unplug the electrical connector from the underhood evaporative emissions purge valve. Does the noise go away?
3. Is the vehicle experiencing a hard start after refueling with the afore-mentioned DTCs?
4. Replace the evaporative emissions purge valve located in the engine compartment. Refer to workshop manual, section 303-13.