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Through the joint efforts of BKM, SPI, AFS and Belarus, an advanced, all- electronic dual fuel system has been developed for retrofit applications on the Belarus D-144, four-cylinder, 4.15 liter, 44.7 KW diesel engine. The system features all electronic control on both full diesel or up to 90 % gas with automatic and instant changeover capability. The existing mechanical diesel injection system was replaced with an all electronic, hydraulically actuated, diesel injection system coupled with timed multi-point electronic injection for the gas system. The control strategy does not utilize inlet throttling typically used on gas fueled engines. The effectiveness of this simplified control system is assumed to be the result of a degree of charge stratification. The D-144 engine is utilized in a wide variety of industrial, farm and highway applications. Special application requirements can be accommodated by programming the EPROM control chip.