Diesel fuel injectors work by transferring fuel from the supply line to the fuel injector device which is attached to each cylinder where it is pressurized and then sprayed through a small nozzle into the cylinder"s combustion chamber. While a diesel fuel injector working, the highly pressurized fuel inside the fuel passage can cause the stress and deformation of parts of the injector and by extension, it may be a cause of malfunction of the injector. In this paper, the stress distribution and deformation of a 2,000bar diesel fuel injector model2 are analyzed using finite element method and compared with model1 for suggestion of better design.