Ford 2007 F-650 Owner's Manual page 187

Maintenance and Specifications
Draining the fuel filter/water separator – 6.0L Power Stroke engine
Water should be drained whenever
WATER
the warning light comes on or every
IN
5,000 miles (8,000 km).
FUEL
1. Stop the vehicle and shut off the engine.
2. Locate the drain valve and place
a suitable container at the end of
the drain tube.
3. Turn the drain valve to the drain position and allow water to drain out.
Note: Drain until the water/fuel mixture becomes only fuel.
4. Turn the drain valve to the closed position.
5. Restart the engine and check WATER IN FUEL indicator light; it
should not be illuminated. If it continues to illuminate, have the fuel
system checked and repaired.
Draining the fuel filter/water separator - Cummins B engine
Refer to your engine operator's manual for service procedures.
186
2007 F-650/750 (f67)
Supplement
USA (fus)