Where is the water seperator on a 2004 F250 diesel 6.0?

On a 2004 Ford F250 diesel 6.0, the water separator is located on the fuel filter assembly, which is mounted on the driver's side of the engine, near the front. You can find the water separator bowl at the bottom of the fuel filter housing. To drain it, you typically need to use a small lever or knob on the bowl itself. Be sure to follow the manufacturer's guidelines for maintenance and draining.