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The reduction of development time of new Internal Combustion Engines prototype and reduction of fuel consumption are key issues in automotive Industry. Lubricating oil pump systems having potential of reducing fuel consumption by up to 3% in the new European Motor Vehicle Emission Group (MVEG) Cycle. Oil pump feeds lubricant oil into the parts of engine to prevent wear and to cool the moving parts of the engine. Gerotor pump is a special kind of internal rotary positive displacement pump which is driven by crank shaft. It provides high volumetric efficiency and smooth pumping action, and it works well with a wide range of fluid viscosities. Tip to tip clearance, volumetric efficiency, flow ripple and cavitation damage are causes for concern in Gerotor pump with high output flow. To optimize the pump performance, it is essential to understand the flow dynamics inside the pump.