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This paper deals with the dual-fuel supply of a compression-ignition engine fueled with diesel oil and biogas. The aim was to investigate the influence of the location of biogas injectors in the engine intake system on the selected characteristics of the air-biogas mixture introduced into the cylinders. A 3D scanning of geometrically complex elements was used as part of the development of a detailed 3D model of the engine intake system. A simulation of the fluid flow was performed for several variants of biogas injector location. The boundary conditions for the simulation were determined experimentally, in the engine dynamometer tests cell. The obtained results were analyzed in terms of the homogeneity of air-biogas mixture formed in the intake manifold. Finally, the optimal location of the injector was identified. The conclusions from the study provide guidance for the implementation of biogas injection solutions in compression-ignition engines operating in dual-fuel mode.