One problem related to oil pump has been reported for the 2002 Ford F-250. The most recently reported issues are listed below.
High pressure oil pump o-ring failure. (1) o-ring failed at 08/30/04 with 30,000 miles. Dealer repaired with updated o-ring kit as specified by Ford bulletin. Covered under warranty (2)o-ring failed again at 08/16/07 with 70,826 miles. Ford dealer repaired with updated 0-ring kit as specified by Ford bulletin. This time I had to pay $100. 00 deductible. (3)o-ring failed again on 06/11/08 with 83,000 miles. Repaired again in 10 month since last repair. I had to pay the full price of repair of 561. 82. Same part has failed three times on my 2002 f250 crewcab 4 door 7. 3 diesel. When o-ring fails the oil is leaking while engine is running. This is not a slow leak but a steady stream as the line is under high pressure. I had to shut down the engine while driving because of low oil pressure and you have no control of brakes or the power steering on vehicle.