A system for controlling a starter for starting a power source includes an air starter relay valve fluidly connected between an air tank and the starter. The air starter relay valve is configured to control an amount of air supplied to the starter from the air tank. The system also includes a control device connected to the air starter relay valve and configured to control the air starter relay valve. The system further includes a fuel valve interlock fluidly connected to a source of fuel via a fuel line. The fuel valve interlock is configured to open based on a pressure in the fuel line and configured to send a signal to the control device for controlling the air starter relay valve when the fuel valve interlock is opened.