While filling the water tank....
New to the forum. While filling the water tank on my 2001 FourWinds the tank would fill for awhile and then blow water back like it was full. When I removed the hose it blew water out with ALOT of air...
Forum Discussion
Usually the vent tube is connected on a fitting on the top of the tank or side of the tank at the top. They never or at least rarely extend down into the tank. Most likely the vent tube has a dip in it with water in the dip acting as a plug not allowing air to escape through vent, the fill tube has a dip in it that is full of water and causing that water to burp back out of the tank as it fills with water faster than the air can pass through the vent tube or both are occuring. You will need to check and make sure they are supported and get rid of any low point that can hold water. I shortened my vent tube to get rid of a 6-inch dip and used wire ties to support both the vent tube and the fill tube attaching them to the cabinet framing under the sink so each would no longer hold water and drain it back into the tank.
My freshwater tank is under the floor below the sink and the vent openings are in the trailer wall behind the sink. I also use a half inch filler hose about 30 in Long that I can push all the way down into the tank through the fill tube. That lets air vent out through both the vent tube and around the hose going into the tank up the filler tube. Now the only time water starts to flow back out through the fill hose my tank is completely full.
My freshwater tank is under the floor below the sink and the vent openings are in the trailer wall behind the sink. I also use a half inch filler hose about 30 in Long that I can push all the way down into the tank through the fill tube. That lets air vent out through both the vent tube and around the hose going into the tank up the filler tube. Now the only time water starts to flow back out through the fill hose my tank is completely full.
