Abstract-The fast development of human population and there comport zones by utilizing a more automobile vehicle, industrial equipment driven by fossil fuel and also agriculture equipment Leeds demand of energy sources. Therefore researcher are made an interest on alternative fuel such as biodiesel, biomass etc., as an alternative fuel. Biodiesel is environmentally friendly clean and non-toxic in nature is became a more advantages to use as substitute in CI engine and also it is one of kind of major renewable energy resources. Biodiesel can extract by transesterification process of vegetable oil and animal fats. According to point of economical view the cost of vegetable oil is more because of that only it not became a popular. However the use of edible oil as feed stock is increases the food issues and further increases the cost of oil. Therefore we were focused to use a used fired cooking is a feed stock of biodiesel extraction process this minimize the cost of production also help in environmental issue and also help in reduce the effect of human health as cancer, skin allergies etc. The main intension of this project is biofuel produced from fired cooking oil and find the properties of extracted biodiesel and compered with the ASTM standards. And made experiment to find a performance of engine like BP, IP, BTH, ITH, nbth, nithetc., are find and compared with diesel for different blend such asB20,B30 and B40. This project shows good performance to use waste fired cooking oil can be successful unitized in CI engine as biodiesel.