Fuel injection systems are essential components in modern internal combustion engines. They deliver the precise amount of fuel into the engine's combustion chamber, ensuring efficient fuel use and optimal performance. By replacing older carburetor systems, fuel injectors provide better fuel atomization and improved engine response. These systems can be categorized into two main types: port fuel injection and direct fuel injection. Port fuel injection sprays fuel into the intake manifold, while direct fuel injection injects fuel directly into the combustion chamber. Both methods enhance fuel efficiency, reduce emissions, and contribute to better overall engine performance.