So we replaced the check valve

City water hookup rv

This did not happen last yearThe most likely

The most likely cause is a bad back-flow check valve. This did not happen last year. So in the event that it is not the check valve, then you will have to fix the source of the leak. Even outside garden hoses can have high pressure levels.

When I have water in my fresh water tank and I run the pump and faucets, I see water coming out my city water hook up connection. We had a similar situation. So we replaced the check valve.

This check valve is there to prevent water that is held in your fresh water holding tank from back flowing out through your city water connection. You may need to tighten the connection s behind the city water connection housing or replace the housing or fix a broken line to the fresh water tank hopefully not.