Originally Posted by k1hog
On my 2004 RT 200P this valve switches between fill fresh water tank and city water.
If you have that valve in that position and the tank is over filling either that valve is leaking or possibly the check valve in the 12 volt water pump is leaking.
Does that valve have any water leaking out the bottom when you have the water system pressurized with the 12 volt pump with no hose or plug in place?
As a matter of course I almost never hook up directly to a city water supply. I use the on board tank and fill as required using the gravity fill in the side door. It's easier to get to and in my case a limiter on overflowing the grey water tank as none of my tank indicator lights work. This is an issue I was going to address but the work around is convenient so I've never bothered. I just tally up the showers and when I get to 7, it's time to fill and dump. With the Covid thing the black tank tends to get a bit fuller as I/we are not using public restrooms while traveling. Just one more adjustment to these times, the level gets obvious when getting full. I only go into a gas station if I'm low on beer and they have a beer cave.