Water tank overflowing
We have a new to us 2013 Phaeton 40 QBH. Love the rig and are enjoying using it.
This past week while in a campground, I find that my water tank overflow is running. I have the water hose attached to the campground water spigot with a pressure regulator set on the faucet before I attach my hose. The selection on water valve is for city water (not tank fill). All the water in the coach works great on city water without the water pump on. The issue started about 3 days into use.
My solution to stop the overflow was to shut off the campground (city) water and just use the water in the tank with the pump on.
I am wondering if I am missing some other setting on the coach in the water area so the tank doesn't fill? If I move the water selection valve to Tank Fill, I can hear the tank filling. If I move it back to city water, the tank filling sound stops. Is there some sort of back flow valve (prevention) that may be stuck open that needs to be looked at in the water system? If so, where is it?
This isn't my first motorhome, so I am pretty good with trouble shooting problems. The water overflowing isn't huge, but it is there and no campground owner wants a rig leaking...
The overflowing location is the pipe coming out of the rigs bottom just in front of the passenger side rear wheels.
Any thoughts from anyone?