IT'S TAKEN ME 2 YEARS TO DO THIS WORK. GIVE ME 30 SECONDS TO PERSUADE YOU TO READ IT. Biodiesel has become a key source as substitution fuel and is making its place as a key future renewable energy source. Biodiesel derived from vegetable oils are quite promising alternative fuels for diesel engines.In this I am going to explain the applications of the Jatropha Biodiesel in future for the replacement of the Diesel because it may no more after some years. So, for this purpose we should go for alternative fuels and i done that work by using Jatropha Biodiesel in direct injection diesel engine and done the testing related to performance and combustion related works in diesel engine.