Originally Posted by Mark and Becky
I recently noticed that our black tank is draining with the the valve control in the closed position. The valve control feels like it's working normally, but when the valve control is pulled to drain the tank, nothing is coming out of the hose. We have been at a full hook-up site for a month, and the tank is not even close to full, leading me to think the drain valve is either wide open or partially open allowing the tank to remain drained. Any ideas as how to get it closed again and working properly?
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More than likely has a little something stuck in the mechanism.
If you have a flush valve, you can connect a hose and fill it up then flush it a few times...hopefully will clear the blockage. (My gray tank has a little block but flushing it a few times seemed to fix it.)
While emptying it, open and close the valve a few times while water is flowing out.