2-FUEL is a system developed by ECT for the diesel engine market. The 2-FUEL system replaces most of the diesel fuel with natural gas. A small amount of diesel is injected, with natural gas, to ignite the air/ gas mixture, like a sparkplug. See how 2-FUEL combustion works. By displacing dirty, expensive diesel fuel with natural gas, fuel savings and lower emissions become a reality. There are many reasons to convert your diesel engine to 2-FUEL. To see why 2-FUEL is the best product available see the Benefits page. To see the Engine Models that are ready for conversion visit our engine model list page.