fresh water tank

Danford50 wrote:
thanks everyones what do I need to check for in order to fix my problem

If it happens again turn off city water. turn on pump and run some water. turn off water. repeat. turn off the pump and return to city water, do not run the pump while on city water. If problem persists install an inline check valve. The pump can be easily taken apart and cleaned.

I do not use the city water connection. I understand as the water comes in from it there is a check valve. If the pump is turned on and the water pressure goes below 40lbs it will turn on.

If you were filling the tank while on city water. Some valve in the pump was not doing what is should do. That is, prevent water going through the pump into the water tank. Who knows, it could have had something holding a valve open.

If the pump works normal without city water I would not worry about it.

I know nothing about drain taps mentioned above.

AJR wrote:
I do not use the city water connection. I understand as the water comes in from it there is a check valve. If the pump is turned on and the water pressure goes below 40lbs it will turn on.

If you were filling the tank while on city water. Some valve in the pump was not doing what is should do. That is, prevent water going through the pump into the water tank. Who knows, it could have had something holding a valve open.

If the pump works normal without city water I would not worry about it.

I know nothing about drain taps mentioned above.

+1.
We have a pump, and aren't afraid to use it.

" +1.
We have a pump, and aren't afraid to use it. "

Me too. Its actually a good idea and good habit to get into in case the campground water takes a nose dive for whatever reason. I have had CG water lines break and had to wait a day for someone to repair the line.
Having a full tank of on-board water off my water pump will give me water.
I also carry along a spare pump. Been stuck 2x in the middle of the woods with a downed pump.

There are only 2 ways for city water to find it's way into the fresh water tank:

1. The built-in check valve inside the water pump could be leaking; sometimes simply running the pump a bit will clear what ever tiny bit of debris was causing the issue. If it continues, they can usually be rebuilt.

2. The City Water Tank Fill Valve is leaking. Sometimes opening & closing the valve several times, solves the problem, sometimes the valve handle has slipped and is no longer turning the inside valve all the way. Of course, this can only occur if you actually HAVE a valve that allows freshwater tank filling from the city water hookup. If not, then ONLY #1 applies.


A leaking check valve at the city water hookup will NOT leak into the freshwater tank; it will leak water outside of the RV when you are running the pump and there is no hose hooked up.

I have had this problem with Anderson kantleak valve and there are numerous posts for years about this happening. Not the pump in my opinion. I even put new pump in. Anderson did a new valve last year supposed to fix this issue. I installed it last summer after paying Anderson for new valve. Worked last summer but out one week now and it’s doing the same thing. There must be a competitor with a valve that works?

I had this problem once. What I did was disconnect the city water, turn on the pump, run the house water for a second or two, turn off the pump, open a faucet to relieve the house water pressure, then attach the city water again. Hasn`t happened since. I don't know how these valves work but I suspect there was a speck of something stuck in the system which was flushed away.. now before I hookup the city water, I make sure the pump is off then relieve the house water pressure.