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Proper design of the compression ignition engine fuel system requires various fuel injection methods analysis. Direct and indirect CNG injection process simulation research has been conducted. The results allow mixture homogeneity analysis and its impact on combustion process and heat transfer. For indirect injection the injector is placed in intake channel and the injection is performed during intake stroke. For direct injection the specially designed injector is installed in place of glow plug. Analyzed case is set for 20% energetic ratio of diesel fuel and 80% of methane. In order to perform the calculations special combustion model has been implemented that allows duel-fuel combustion in compression ignition engine. The results show the benefits of direct CND injection through increased mixture inhomogeneity.