Single point fuel injection systems
In this type of system, only one injector feeds all four cylinders of the engine. In this way, in these systems, the injector sprays the fuel required by the engine into the fuel manifold. The fuel transfer quality of these systems is similar to carburetor systems. The presence of the electronic control unit provides more suitable and favorable conditions in the combustion chamber.
Multi-point fuel injection systems
In these systems, one injector is considered for each cylinder. These injectors, which are mounted on the fuel rail, inject the fuel required by the engine directly behind the fuel valves. The result is that the fuel undergoes less changes after injection until the ignition time and flows into the cylinders in better conditions. These systems are used more than other types today.
Direct fuel injection systems
The purpose of inventing this type of system was to achieve a minimum change in fuel conditions before entering the cylinders. In this way, the injectors inject the fuel needed for combustion directly into the cylinders without intermediaries.