I have a 2007 Monaco Camelot and I can no longer add any water using the black water tank flush connection. It has worked in the past but no longer. I believe there is a check valve in the line somewhere, but not sure where. I have removed the hose connection/plate and it is not on the backside. I have been told it may be in the cabinet under the bathroom sink, but doesn't appear to be there either.
I called Allied Recreation Group (Monaco), but they have not called back so far.
Any ideas would be appreciated.
Larry