Ford F-650 2001 Owner's Manual page 186

Maintenance and care
Fuel filter/water separator
The fuel filter/water separator removes any contaminated particles
and/or water from the fuel before the fuel enters the engine.
The fuel filter/water separator should be drained as recommended in the
Scheduled Maintenance Guide.
Draining the fuel filter/water separator—Caterpillar 3126 B engine
1. With the engine off, open the
drain valve located at the bottom of
the fuel filter/water separator by
turning it counterclockwise.
2. Drain the filter until clear fuel is visible.
3. Turn the drain valve clockwise to close the valve. Do not overtighten the
drain valve as this could cause damage to the fuel filter/water separator.
Draining the fuel filter/water separator—7.3L Power Stoke engine
1. With the engine off, open the
drain valve located on the side of
the fuel filter/water separator using
your hand.
2. Drain the filter until clear fuel is visible.
3. Close the drain valve completely.
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