I have the same problem on my09 30SK with water coming back out of the flush connecter when I disconnect the hose. I have disconnected the hose at the hose bib first to release hose presssure but water does come out at the panel connection. Could be as mush as a 1/2 cup or so. I place a towel under it now and I am going to have my dealer check it out. I also had the flush tank filter/sprayer on the tank end get plugged. It is a perforated 4" like plastic piece that gets plugged from the inside out with tank crud because it is located below the water line in the tank. My dealer removed the pieceand it does allow water to enter the black tank now. No spray, just fill and flush. I may need to have a new type of spray end installed.
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jjriff John & Julie
2012-GMC 2500HD LT CC,6.6L Duramax 4X4
2009 Cruiser CF30SK Patriot
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