To study the effect of propane injection on gasoline fueled passenger vehicles fuel economy and cost saving the concept of a modular partial injection system was developed. The injection system was designed with the ability to be fitted in any gasoline fueled vehicle. The Control of the propane injection module was assembled with two stage system of regulators for coarse and fine adjustment of the propane flow to the engine. A digital manometer was used to adjust the pressure across the needle valve. The developed modular system was sealed and housed in a control box mounted to the side of the propane supply tank. The developed system was then fitted in a passenger vehicle and road tested for efficiency and cost savings.

In this paper, the design and development criteria in addition to the physical build of the modular propane injection system will be presented. Also, the fuel economy and cost saving from the road test results will be discussed.

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