Fresh water tank problem

[glforcve357@cox.net]

Fresh water tank (portable water) will fill while hooked up to city water. What would cause this?

[Beau388]

Originally Posted by glforcve357@cox.net

Fresh water tank (portable water) will fill while hooked up to city water. What would cause this?

A leaking one way valve on the water pump head.

[chunker21]

Some water systems in RVs that's the way you fill the tank. You don't indicate what RV you have but in many there is a wet bay with various connections and valves. Depending on valve selection the fresh water may go to the house and provide city water, or fill the fresh water tank.

[boggsy64]

I agree with Beau388. I replaced my old pump with a new one that did not have a check valve (one way valve). I didn't know it was missing a check valve until my fresh water tank overflowed all over my campsite.