If the engine cranks but will not start, this may be caused by damaged wiring to the high pressure fuel pump. Wiring to the pump can be chafed, which causes the pump to stop working. The chafed wires will need to be accessed and repaired.Google+
Car Problem Reports
Ford F-250 Super Duty Engine Cranks but will Not Start - Diesel
Ford F-250 Super Duty Problem
Engine Affected: 6.4L V8 Diesel Turbo
Average Mileage: 87,120 mi (12,000 mi - 152,000 mi)
Visitor, 2008 Ford F-250 Super Duty, 6.4L V8 Diesel Turbo, 152,000 mi
The engine died would not start
Visitor, 2008 Ford F-250 Super Duty, 6.4L V8 Diesel Turbo, 12,000 mi
Engine crank but not start
Visitor, 2006 Ford F-250 Super Duty, 6.4L V8 Diesel Turbo, 128,000 mi
My truck will not start after it's been turned off unless I let it sit for an hour or two. It will turn over but not start. I have not had this problem fixed yet.
Parked vehicle, when I came back the engine would crank but would not start.