Diesel engine fire pump controllers are designed to automatically start a diesel engine driven fire pump upon detection of a pressure drop in the fire protection system. A diesel engine fire pump controller provides automatic & manual starting and stopping. An automatic start is controlled by a pressure transducer or by remote automatic devices as deluge valve. A manual start is controlled by a remote manual button or by controller push button. The automatic shutdown option provides a 30-minutes automatic stop after automatic start once all starting causes have returned to normal. The diesel engine fire pump controller includes two battery chargers to maintain the engine batteries continuously charged.