Natural Gas Conversion for Stationary Diesel Engines

The EVO-SP™ kits allow operators of electric power generators to substantially reduce costs, extend emergency run-time and improve sustainability by substituting diesel fuel with lower cost, cleaner burning natural gas (NG). The EVO-SP System is comprised of proprietary and patent-pending technologies that allow the safe use of natural gas in place of diesel fuel, with substitution rates ranging from 50% to 70% of the generator’s total fuel requirement. Generators converted with the System exhibit diesel-like performance in such critical areas as load acceptance, power output, stability and efficiency. See which EVO-SP System is right for your application. Contact us for more information.


The EVO-SP System allows for the on-site conversion of stationary engines to natural gas and diesel (NG+D) operation. The conversion process utilizes components that are installed externally of the engine/generator and no changes or modifications to the cylinders, pistons, fuel injectors or cylinder heads are required. By retaining the OEM diesel fuel system in its entirety, the EVO-SP System maintains the engine’s capability to operate solely on diesel fuel when needed. The System utilizes pipeline-supplied natural gas at pressures of 3-7 PSI and supplies low pressure fuel gas to the engine using an electronically controlled throttle-body integrated with a fixed-geometry, low restriction air-gas mixer. Installation is performed using conventional tools and equipment and requires about 6-8 hours to complete.

Electronic Control Unit

The EVO-SP System includes a powerful Electronic Control Unit (ECU) that monitors critical engine and generator data to dynamically control the operating fuel ratio of the engine. The ECU is J-1939 compatible and monitors mass airflow, generator power output, diesel fuel flow and other engine parameters in order to continually optimize gas substitution rate based on operating conditions. Fuel mapping changes are performed on a real-time basis using sophisticated control algorithms that are updated fifty times per second. The ECU provides engine protection and monitoring functionality with pre-alarm, alarm and shut-down control logic that allows the engine to be switched from NG+D mode to diesel-only operation seamlessly and automatically. The ECU has been designed for easy installation using pre-configured wiring harnesses and mil-spec quick connectors.

Control Panel

The EVO-SP System allows for quick and simple access to both real-time and logged system data using a proprietary graphical user interface (GUI) displayed on a state-of-the-art touchscreen panel. The touch screen panel is a mounted in a NEMA 4X stainless steel enclosure and includes an external emergency stop (E-stop) switch. Primary power is controlled via a switch located inside the control panel and a master system enable switch is provided to allow the EVO-SP System to be powered-up for testing and diagnostics in 100% diesel mode.