A Fuel Injector is used to carry the fuel to an internal combustion engine, which is mostly found in automotive engines using an injector. This injector is dedicated to transporting just the fuel, from the tank to the engine. A vehicle that runs on diesel uses a fuel injection, and on the other hand, vehicles that run on petrol use the gasoline direct injection. In which the fuel is directly delivered to the combustion chamber. Or there are also indirect injections that allow the fuel to mix with air, before its intake stroke. The fuel injector is designed to atomize the fuel using a small nozzle under pressure, while the carburetor completely relies on suction that is created by the intake air; that is accelerated through the venturi tube, that draws the fuel to the airstream. The fuel injector in both the diesel and petrol vehicle plays a huge role.