3500 4x4 Pickup L6-359 5.9L DSL Turbo (1996)
Fuel Filter: Service and Repair
Draining Water From Filter
Drain Valve At Fuel/Water Separator
The filter should be drained whenever the water-in-fuel warning lamp remains illuminated. (Note that the lamp will be illuminated for approximately two
seconds when the ignition key is initially placed in the ON position for a bulb check). The drain valve can also be used to drain excess fuel from the filter
when replacement of the filter is necessary:
There is a drain valve and drain hose located at the bottom of the water-in-fuel (WIF) sensor. Place a drain pan under the drain hose. With the engine not
running, push up on the drain valve to remove the water from the filter/separator. Hold the drain valve open until all water and contaminants have been
removed and clean fuel exits the drain. Dispose of mixture in drain pan according to applicable regulations.