Difference between single point and multi-point fuel injection system [with Pdf]

The main difference between single point and multi-point fuel injection systems is that the single point fuel injection system uses a single fuel injector for the mixing of fuel with air while the multi-point fuel injection system has a separate fuel injector for each cylinder of the engine.

What is Single point fuel injection system?

It is the fuel injection system that uses a single fuel injector for the mixing of fuel. In this system, the fuel is mixed with air before it reaches to the intake manifold.

The single-point fuel injection system is also known as the throttle body fuel injection system.

What is Multi-point fuel injection system?

Multi-point fuel injection is the type of fuel injection system that uses a separate fuel injector for each cylinder.

The injector sprays the fuel in the intake manifold above the intake valve of each cylinder.

This fuel injection system is considered as more efficient than the single-point fuel injection system.

Difference between single point and multi-point fuel injection system:

Sr.No.Single-point fuel injection systemMulti-point fuel injection system
1It uses only a single injector for fuel injection.It uses a separate fuel injector for each cylinder.
2The fuel is injected before the intake manifold.The fuel is injected into the intake manifold before the intake valve.
3It is arranged before the throttling body.It is provided after the throttling body.
4It is also known as throttle body injection.It is also known as a port fuel injection system.
5The air-fuel ratio is not uniform for all the cylinders.The air-fuel ratio is more uniform than single-point fuel injection.

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