Water-In-Fuel Draining Procedure (6.6L)
WARNING: This page does not describe the selected car, but rather 31 other vehicles, including the 2002 Saturn Vue, 2002 Pontiac Montana, 2002 Pontiac Aztek, 2002 Oldsmobile Silhouette, and 2002 Oldsmobile Bravada. However, it is still accessible from the selected car via links, so may be relevant.
Disconnect negative battery cable(s). Install a hose to water drain on water-in-fuel sensor. Place other end of hose into an approved container. Drain as much fuel as possible from fuel filter housing. Tighten water drain on water-in-fuel sensor.