Drain the water and sediment from the separator each time the fuel tank is filled.
Shut off the engine. Manually open the drain valve until clear fuel is visible.
Top Load Filter Type (1)
Pull up on the drain valve lever until fluid drains out of the drain tube. If nothing comes out of the drain tube, lift the lever several times to break the vacuum seal.
Spin-on Filter Type (2)
Lift up on the drain valve until fluid drains out of the drain tube. When finished, make sure that the valve closes.
NOTE: Some of the early 1st generation trucks have a screw valve without the WIF sensor. For these filters, you must unscrew the valve until the drain opens.
[thanks to dodgeram.org used with permission]