Water pump sending water overboard
We have a “new to us” 2014 Winnebago View 24V. When running the water pump to fill the toilet or wash hands I discovered that the water levels were dropping rapidly. I discovered that any time the pump runs it also dumps water out, what appears to be, either the fresh water tank drain line, or the over flow line. I have checked all of the valve levers I am aware of and all appears normal. Looking for hints of what I missed. I’m assuming it’s a Newbie mistake but I’m at a loss. Suggestions? Thanks in advance!