For quite some time I've noticed my well pump is full of air. Originally you could see condensation on the lower half of the tank and when you knock on the tank housing you could tell there was water in the lower half and air in the top half. For the last couple of years when you knock on the tank it is hollow from the top of tank to ground level, and there is no longer any condensation on the outside of the tan housing. Is there a way to bleed the air out of the tank housing? I've looked the housing over and the only visible opening in the housing is about 12 inches up from ground level is a gauge which is screwed into side of housing.

Is it a diaphragm tank? If so, it will have an air valve at the top of the tank.

Also, do you still have water pressure in the house? It would also be good to know if your pump is short-cycling, meaning that when you are using water, the pump runs for a few seconds, shuts off for a few seconds, back on, back off, and so forth.

For quite some time I've noticed my well pump is full of air. Originally you could see condensation on the lower half of the tank and when you knock on the tank housing you could tell there was water in the lower half and air in the top half. For the last couple of years when you knock on the tank it is hollow from the top of tank to ground level, and there is no longer any condensation on the outside of the tan housing. Is there a way to bleed the air out of the tank housing? I've looked the housing over and the only visible opening in the housing is about 12 inches up from ground level is a gauge which is screwed into side of housing.

Most bladder tanks have a air valve on top of the tank so that the air pressure may be adjusted. If it does not then you have a pressure tank. As long as a pressure tank contains air it's doing its job. The time to be concerned is if the tank fills up completely. Good luck, Tom