Abstract: An automated liquid holding tank and method for automatically filling a liquid holding tank. The tank comprises a holding tank with dispensers for filling the tank with liquids and a pressure sensor attached to the tank for measuring the liquid level within the tank. The pressure sensor also provides a tank liquid level indicator output signal which is sent to a controller that compares the output signal with a pre-set value. When the output signal matches the pre-set value the controller closes the dispensers. The pressure sensor includes a gas bubble within a connecting tube to communicate the tank liquid pressure to the pressure sensor.