More sophisticated engines have fuel directly metered into the induction manifold and then into the cylinders without using a carburetor. This is known as fuel injection. With a fuel injection system, each individual cylinder is provided with a correct mixture via a Fuel Control Unit (FCU), which directs fuel to the cylinder based on the airflow. This allows for tighter control of the desired fuel mixture and ensures improved fuel economy.
Advantages of a fuel injection system include:
Reduced susceptibility to icing, however, impact icing on the intake remains a possibility
Reduction in evaporative icing
Better fuel flow
Faster throttle response
Precise control of the mixture
Better fuel distribution
Easier cold weather starts
Disadvantages include
Difficulty in starting a hot engine
Vapour lock during ground operations on hot days
Problems associated with restarting an engine that quits because of fuel starvation
Fuel Injection System Diagram
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