Fuel Injector

Single-point fuel injection, also known as throttle body injection, usually uses one fuel injector located near the throttle body to distribute fuel into the intake manifold. While it was a significant improvement over carburettors, this system is less efficient than more modern methods, as it doesn’t offer precise control over how fuel is distributed to each cylinder.

In multi-point fuel injection systems, each cylinder has its own fuel injector nozzle, placed directly into the intake port, hence the name of this type of fuel injection. This is more precise than single-point injection and allows for better fuel distribution across all cylinders, improving fuel economy and engine performance compared to single-point systems.

Sequential fuel injection is a more advanced version of multi-point injection. Instead of all injectors firing at the same time, each injector delivers fuel to its respective cylinder precisely when needed. This timing improves both fuel efficiency and power by ensuring that the combustion process is as effective as possible.

Direct injection is the most advanced fuel injection system. In this type of fuel injection, fuel is injected directly into the combustion chamber, allowing for better atomisation of fuel and more efficient combustion. Direct injection systems are particularly common in diesel engines, but they’re becoming more popular in modern petrol engines due to their efficiency and power benefits.