What size socket does it take to take the fuel filter off Nov 16, 2008What size socket does it take to take the fuel filter off of a 2004 f250 diesel? - Answered by a verified Ford Mechanic Remove the fuel filter cap by turning counterclockwise using a 36mm socket and a pivoting head ratchet or a high quality oil filter type wrench will do. I want to change the fuel filters on my 2006 f250 6.0 diesel 2006 FORD F-250 SUPER DUTY 6 V8 DIESEL Turbocharged Fuel Filter Socket. Fuel Filter Spring. Fuel System Repair Manual. Oil Drain Plug. Oil Drain Plug Gasket. Oil Filter. Thermostat. Wiper Blade FORD 2006 F-250 SUPER DUTY 6 V8 DIESEL Turbocharged Fuel & Air Fuel Filter. Price: Alternate: No parts for vehicles in selected markets.