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Using CNG (compressed natural gas) as a fuel for diesel engines certainly results in the reduction of pollutant emissions. Having several merits in the viewpoints of the wide driving range due to the running possibility by using only diesel fuel, and no major modification on the engine, dual fuel engine is much effective and adequate than other CNG types to improve air quality in urban areas. In order to convert existing diesel engine for truck to CNG-diesel operation, it is necessary to compromise engine power with emissions. In this study, we have developed a CNG-diesel dual fuel supply system through the modification of mechanism in injection pump, the supplement of gas mixer, and mechanical control system and measured power, fuel consumption rate, and emissions.