1：Did you know?
The electronic fuel injection system of an automobile engine generally consists of three main components: fuel injection system, sensor assembly, and electronic control unit. Injectors are installed on the intake manifold of each cylinder, allowing gasoline to be injected into the cylinders from multiple locations. This is known as multiple-point electronic fuel injection.
2：Difference from Single-Point Injection (SPI)
When comparing Single-Point Injection (SPI) and Multiple-Point Injection (MPI): SPI involves the computer-controlled injection of fuel into the intake manifold, which is then drawn into each cylinder for combustion. It uses a single injector for the entire engine. On the other hand, MPI directly injects fuel into the intake manifold for each cylinder, with each cylinder having its own injector. Multiple-point electronic fuel injection has become the matured technology and is the mainstream product. Due to the direct injection into each cylinder, it offers more precise air-fuel ratio control, better emissions, and improved fuel efficiency. Single-point electronic fuel injection, as a transitional technology from carburetors to electronic fuel injection, does not require changes to the original engine cylinder design and can be easily installed by replacing the carburetor with a set of computer-controlled equipment.
3：Main applications
If the injector is installed in the original carburetor position, with only one fuel injection point for the entire engine, it is called single-point electronic fuel injection. If the injector is installed on the intake manifold of each cylinder, with gasoline injected from multiple locations (at least one injection point per cylinder), it is called multiple-point electronic fuel injection.
