The proper setting for the pre-charge of air in the FL7 Pressure Tank is 2PSI less than the kick on pressure. For example if the pump activates at 30PSI then the pre-charge air pressure would be 28PSI. It is important to note that air pressure should be set when the tank is completely empty of water. From new, the FL7 comes with a setting of 38PSI air charge. This will need to be adjusted to the value which is 2PSI less than the kick on pressure. If the air charge is not set correctly, your pump and pressure tank will not function correctly and could be the cause of the issue you are experiencing.