Abstract: An automatic self contained internal combustion engine fire pump controller for testing and operating an internal combustion engine coupled to a water pump for maintaining water pressure in a sprinkler system. The sprinkler system includes a deluge valve for reducing the water pressure, and the engine has a starter motor, a starter solenoid connected to the battery, and a separate fuel supply. A housing contains the controller, and includes a selector switch having at least a manual run position, and an automatic run position. A fuel valve controls the fuel supply to the internal combustion engine. A pressure transducer senses the fluid pressure of the sprinkler system and has its input connected to the central processing unit. A central processing unit is responsive to the automatic position of the switch and is coupled to the fuel valve, the deluge valve and the pressure transducer means.