I have a Salem Hemisphere 2015 282RK. We are at a seasonal site and are connected to the fresh water supply and do not use the fresh water holding tank or the water pump. I do winterize the fresh water system and pump even though we don't use it, and when flushing out in the spring, I leave the drain valve open to the fresh water holding tank.
We've been at this site for 4 seasons and I've done the same thing each year.
I opened up the camper this spring, and hooked up the fresh water hose to the "fresh water" connection and flushed out the tank and pump. Then,, as normal, I connected the water supply to the "city water connection" and flushed out the antifreeze in the rest of the lines. Everything was good.
About 2 days later, I heard the noise of a water leak splashing on the ground and discovered water was flowing out of the drain valve from the fresh water tank. Now nothing is connected to the tank inlet and there should be no water in the tank.
My only guess is that water from the pressurized side of the lines is back flushing through the pump into the holding tank. There is a filter on the inlet side of the pump (conveniently
) located under the sink behind a panel. I do not see any check valve, unless its integral to the filter. Other than the connection on the outside of the trailer to fill the water tank, there is no other inlet to the holding tank other than the pump hose.
I have not taken the pump out to inspect it. The pump is a SHURflo 4008 by-pass pump.
There are no water leaks in the trailer. If I let the tank fill and run the pump with the city water shut off, all works as it should.
Why this all of a sudden happened this year I don't know unless there is a some debris or deterioration in the pump workings as a result of age or no using it.
Has anyone had this or heard of this situation?
I am thinking of putting a shut off valve on the outlet side of the pump where it connects to the water supply to keep the water from back flushing through the pump. Since we don't use it on any normal basis, I would just have to remember to open it if and when we do need the fresh water tank.
Does this sound like a reasonable solution?