Fresh water tank
I tired to fill my fresh water tank in my Forest River Class C motor home 2008. While adding water to the tank it began running out of a plastic tube open to the outside of the rear of the RV. This i...
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That sounds more like your potable water tank drain line to me. Usually, near the water pump is a diverter valve. In one position, it allows water to pass from the tank, through the pump, and to the fixtures in your camper. In the other position, it allows the tank to drain out onto the ground. It appears your valve is in the "drain" position. Try turning it to the other position and fill your tank.
