Fred, are you talking about the water "Drain" button on the Racor fuel filter housing?I have not seen a purge button for the air system. Normal operation of the air dryer is that it purges any water in it each time the compressor reaches the pressure cut off (around 125 to 130 psi). That "pssshhhh" you hear under the coach is also purging the air dryer. If you have a button for this - I have not seen this. Where is the button located? Maybe I'll learn something new.
FredThe water purge uses a sensor at the bottom of the bowl to tell the controller that there is water in the bowl with out water in the bowl the controller will not initiate a water purge cycle.The sensor has two wires connected to it one is grounded and the other is the sensor wire which runs to the controller it you simply disconnect the sensor plug and jump the two terminals on the harness them push the H2O purge button the system should run a purge cycle ( be prepared to catch the fuel it will pump out).PS I have seen two of these units where the wire which controls the purge solenoid was broken inside the housing requiring the unit to be dismantled to repair the broKen wire pretty straight forward.Hope this helpsEric
That is correct. Try the air purge side. If you hear the pump running, then all is good. Hope this helps.
Fred,I found this in our technical section under Racor. Note the item just above #6 is an in-line glass fuse holder. Not sure where that is located on your coach but must be near by, Fred