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Fuel injection parameters play an important role in diesel engine performance for obtaining proper combustion. The performance and emission characteristics of diesel engine depend on many parameters. The important parameters which influence the performance and emission of diesel engine are fuel injection pressure, fuel nozzle holes and its size. An experimental study was performed on a light duty direct injection diesel engine at 200 bar, 220 bar and 240 bar injection pressure to study its effect on performance and emission. The injection pressure was changed by adjusting the fuel injector spring tension. Future emission legislation will require substantial reductions of NO x and Smoke emissions from diesel engines. The combustion and formation in a diesel engine is governed mainly by spray formation and mixing. Important parameters governing these are droplet size, distribution concentration and injection velocity. Smaller orifices are believed to give smaller droplet size, even with reduce injection pressure, which leads to better fuel atomization, faster evaporation and better mixing. The performance and emission characteristics were presented graphically to conclude that they were found better with 5 hole nozzle of Ø = 0.2 mm at the fuel injection pressure 220 bar for the light duty engine.