City water fill

Yep! I started having the same problem. I really believe it is the three way ball valve that started leaking through all of a sudden. To buy the original part from ShurFlow it costs around $400.00. I am planning on just buying a three way valve for around thirty dollars and change it myself. I do not need the plate that shows what the valve is opened to, filling tank or city water. The plate just shows when pointed in one direction or the other what it is doing. Not important to me. So it looks fairly easy to change out, we will see after the weather warms up a little. Too cold right now to do anything outside. LOL!

4x4van wrote:
If you have a valve to allow you to fill the tank from the city water hookup, it's leaking. If you don't have that valve, then the check valve in the water pump is leaking.

X2, time for a valve repair or a new valve (depending on valve). It MAY be lime clogging it in which case if you are comfortable flushing the valve with lime-away it may work (but please rinse well if you do it this way).

4x4van wrote:
If you have a valve to allow you to fill the tank from the city water hookup, it's leaking. If you don't have that valve, then the check valve in the water pump is leaking.

Correct......

2 methods of water leaking into fresh water tank.

'Fill Valve' OR pump internal check valve


Disconnect pump suction line at pump, turn on city water and see if water backflows thru pump

If thru pump.....running it, using the water in fresh water tank can flush any debris/deposits on check valve diagram.
Otherwise....replace pump.

If 'Fill Valve'----replacing it best cure

If you have a valve to allow you to fill the tank from the city water hookup, it's leaking. If you don't have that valve, then the check valve in the water pump is leaking.