I have a 2006 with the airdog 150 when changing them I started by draining the H2O sep. first....seems like its draining the whole tank after 5 gallons later I shut it off. should I drain and change when he truck is empty ???? I dont want to pull the filters offand fuel go everywhere ??? Thanks

 

You are creating a siphon effect somehow. I would suggest cracking the h20 valve then breaking loose the filter. Should stop the flow of fuel from the tank. Also I would suggest using Donaldson filters. They are cheaper, last twice as long and are 2 micron instead of the 5 micron from airdog.

 

I am actually using Fleetgaurd filters Which are 2 micron also on my Airdog got both for $31I will try what you suggested. Thank You