Only need drained when water in fuel light comes on. Filter needs changed every 15,000 miles or once a year.
A 1998 Ram with the Cummins diesel has a water in fuel indicator on the dash that will illuminate if there is water in the fuel filter housing.
That is the fuel filter on the driver side of the engine block.
Driver's side of the engine block. There is a black cap that screws off. Pry the old filter out of the cap and snap the new filter back into the cap. Make sure to drain any water or trash from the housing.
Change the fuel filter or drain the water out of the fuel filter.
Water drain and water in fuel sensor.
That sounds like the water in fuel drain valve. It would probably only be available from either a Dodge dealer or a Cummins truck shop.
Drain the coolant, remove belt, remove two bolts & water pump. Clean the sealing surfaces. Reinstall in reverse order
On the fuel filter!
The fuel filter/water separator is on the driver side of the block.
It is on the pass side front of the engine.
by putting water in the gas tank