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In developing countries, the recent rise in the operating cost of gasoline passenger cars has forced vehicle / fleet owners to opt for alternative gaseous fuels like CNG and LPG. Due to non-availability of the efficient gaseous systems from OEMs, many ‘retro’ or after market kits are being used by the vehicle owners to take the advantage of the low kit cost. These after market systems pose major issues related to engine warranty, safety, emission compliance, performance, driveability and adverse effect on the main stream gasoline engine. This paper describes the development of 1.2L, Bi-fuel (Gasoline – LPG) MPI engine for the Indian market. The objective of the project is to develop a bi-fuel LPG variant of the already existing gasoline engine without compromising on performance, driveability, safety and emissions with minimum cost impact. Precise control of LPG operation necessary to meet the engineering targets is achieved by use of EMS in master-slave architecture.