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I changed my fuel filters today on my 08 Ford F350 6.4L Diesel and thought I post some information on this here. The Filters come as a kit at Napa for about $75.00 Alot cheaper than the Ford Dealer. I firstly went below the truck and released the water separator lever, and let A bunch of that out. Then using a 38mm socket took the Fuel filter off the engine, the one on the top, closer to the drivers side. Then you take the one underneath off, that is just below the drivers side on the inside if the frame rail. Its a little tough to get in there, I would recommend you use a socket. Then change the filters, close it back up. Then cycle the ignition by turning on without starting. You can hear the pump for 30 seconds, you will see a wrench on the dash in the display. Once you hear it turn off, turn the key off, then repeat this 12 times. Then the engine should start.
Here is a site that explains a bit.
Here is a site that explains a bit.