If you replaced an old air over water type tank with a bladder style tank, you may have air in the water from the old air injection system that you no longer need.
If you replaced an old air over water type tank with a bladder style tank, you may have air in the water from the old air injection system that you no longer need.
You may have to pull the pump up and plug the valve (or hole in the drop pipe) as it lets air to enter the system. You may also need to cap or plug the Schrader valve on the check valve near the tank.
Should make sure it's entrained air by letting water stand in a clear glass overnight. Clear water, no sand in the bottom means entrained air most likely.