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Only one fuel filter
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.
On the fuel filter!
On top of the oil filter housing
In 2004, the Dodge Cummins Diesel was not equipped with an oxygen sensor. The 2007.5 and newer Cummins 6.7 liter Bluetec diesels have an O2 sensor in the downpipe. Typically, only particulate filter equipped diesels have O2 sensors.
Passenger side front of the engine, accesses from underneath.
You left the important piece of information out - the engine make and model. The FLD120 was available with a number of engine options from Detroit Diesel, Caterpillar, and Cummins.
Yes
Turn it counter clockwise with an oil filter wrench.
6.7l cummins turbo diesel
Front of the passenger side of engine. Look up and behind the ac compressor.