Hello i bought my 1976 Hi Lo locally and they guy was not very informative as to how to use the water. According to him when i fill my water tank it pressurizes the tank to make the water come out the faucets. It does have a small air pump that is controlled with a switch. On the outside by the water fill there is a valve like a tire. Looking to see if anyone can explain how to fill and pressurize the water system so i can flush out the water tank.

Post a picture of your set up and one of us can help.

you fill it with water, about leaving space at the top for the air depending how big the tank is. if it has a guage, it must or should have if not put 1 on it. use 20lbs. of air to start or so start low. or I would figure when you turn the air pump on hooked to the valve stem it automatically pressurizes the tank and shuts off from a relief valve. then turn yer water on. also maybe just leave a faucet open at first and don't put water in it see what happens when you pressurize it. that's what I woud do. hope I could help. its like taking a small plastic drum and putting a tire valve stem on it with a guage then pumping air into the tank that's all its quite simple setup.