Does the pump start as soon as you open a faucet? Watch the pressure gauge while someone opens a faucet - does it almost immediately drop, or does it slowly drop prior to the pump turning on? Or, does it bounce back and forth as the water surges? The job of the pressure tank is to provide some storage of water under pressure to even out the pump cycles, and keep the pump from having to turn on every time you draw a cup of water for a short time. When the water surges, do you get air out, or is it just that the water does not flow smoothly?