Fresh water tank flows out drain hose

Indianaron wrote:
I'm new to rv's and I don't know why my fresh water tank just runs the water out the drain under my Coachmen Catalina. In the past, water overflowed from this hose when the tank was overfilled. The does not seem to be any leak under the camper, just from the drain hose. Any help would be appreciated. Thanks

The drain under the Coachman is a low point drain or fresh water tank drain. Its sole purpose is to drain the tank. It has been left open. Find its valve and close it. The vent hose is beside the opening to fill the tank. The vent hose opening is higher than the water tank to prevent siphoning.