We had the same problem with our 2010 CF29CK. Make sure you use a direct hose to the hookup as we had a backflush valve on ours and it seems that caused the valve inside to open part way and thus leaked.Only a suggestion.
We learned just recently shopping that there are different 2011 units especially Patriot editions. The early ones are a cross between 2010 & 2011 units. The ones built after the first of Sept of this year are the true new 2011 units and have a few distinct differences. I can't remember them but there are a few for sure, I do know that most were upgradesto the model. IMHO jb
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Traveling the country enjoying gods masterpieces.
You could be right. We have a backflow preventer on the house faucet from which I connected a hose to the flush. We sure had a heck of a flood inside the bathroom. Anyway, don't need 2 backflow preventers in the same line. The one in the camper is now gone for good. I am always glad to get rid of stuff that doesn't add to the camping experience.