have had an airdog on my truck for several weeks. i was changing rear driveshaft u joints..... i checked out the recently installed airdog and found diesel fluid on the outside of the bottom of the filters. i checked all elbows, all connections, everything, and no leak......where could the excess diesel on the bottom of my filters come from? the filters were nice and snug; could not find any wet spots on the lines, etc. anyone have this problem? thanks again, TDR'rs!