Originally Posted by txstreamer
When I use water/water pump from my storage tank. All OK.
When I hook up to city water, water leaks from the drain line under my AS. This black plastic drain line is connected to the pressure regulator under the bathroom sink. This kicks out water if the city water supply hose is on a little or full blast. Is there a way to, maybe clean out the regulator? Is it plugged up? If I were to connect a shut off to the regulator drain line so water can not come out onto the ground, would it then blow back and wreck something? Any Ideas?
Look for a "pop off" valve thats located near the water pressure regulator.
On the top of that valve you should see the number "111".
In time, that valve gives up, and then leaks when your trailer is hooked up to city water.
A replacement 111 valve, solves the problem.
It can be removed, if you wish, and the tubing can be plugged.
However, if you do that and have a sudden increase in water pressure from a city hookup, then you take the risk of bursting the copper tubing or a fitting that's soldered together.
When that happens, I assure you, it most likely will happen in a spot that you cannot easily reach.
The choice, or fix, as always, is yours.