Originally Posted by Dennis and Julie View Post
Guess I'm confused every rv we've owned has has a fresh water fill and a city water connection that are seperate and the pump is only used when using water from the tank. So how does your tank fill from city connection?
If your TT looks like the setup in Herk's pic, you can't fill from city water. However, if you have a newer TT with a "winterizing" connection, you can, but not directly. On TT's with a winterizing connection, the connection Tee's in between the FW tank and the check valve in Herk's pic. There's a normally closed manual valve between the winterizing connection and the Tee. In addition, there is a normally open manual valve added between this new Tee and the FW tank. So when you winterize, you hook your antifreeze jug to the winterizing connection, open the winterizing valve and close the FW tank valve and your water pump pumps the antifreeze into your system.
Now, if you were to connect your camp water hose to the winterizing connection instead of the normal city water connection, then open the wintering valve AND the FW tank valve, you can backfill the FW tank with your City Water hose. IF you do this, do it slowly and make sure your FW tank vent is NOT obstructed. You should also open your gravity fill cap to provide a 2nd vent. You don't want to blow up your FW tank.
When I sanitize my FW tank and then to fill and drain it several times to rinse it out, I use this method.