jpdoggett
Well-known member
I have a 2011 Landmark Augusta this not my first fifth wheel, but when I flush the black water tank it builds up pressure in the tank, this is with the drain valve closed, and when we are using the stool it will build up pressure and blow back into the stool, you never know what the level is cause the tank always says it full. Dealer says there is nothing wrong with it that you are to flush the tank with the valve open, and he says I am waiting to long to dump. I have never had this problem with any other brand of RV