Advancements in electronic control, design and automation have revolutionized the fuel control systems for gas- fired reciprocating engines, enhancing their efficiency, stability, and overall performance. Gas Fired reciprocating engines have been used for oil and gas compression for more than half a century. Until a few years ago, these engines all used mechanical governors for running at rated speed only. The methods used to start the engines were improvised using shut off valves and orifices. The engines often were hard to start and when they were running, they were very unstable and difficult to load. Now, thanks to advances in electronics, mechanical design and computer control, these old work horse engines can be started and “Governed” more effectively than ever before. The new fuel control methods combined with better ignition, air/fuel ratio control and load control, can improve fuel efficiency and reduce emissions.