FAA Powerplant Written Practice Test

What is the purpose of the fuel metering section in the Bendix/Precision fuel injection system?

1. To control the air-fuel mixture

2. To meter and control fuel flow to the flow divider

3. To enhance fuel atomization

4. To maintain constant fuel pressure

The correct answer is: To meter and control fuel flow to the flow divider

The fuel metering section in the Bendix/Precision fuel injection system plays a crucial role in regulating fuel delivery. Its primary function is to meter and control the precise amount of fuel that is delivered to the flow divider, which then distributes this fuel to the individual fuel injectors of the engine. By ensuring that the correct amount of fuel reaches the flow divider, the system establishes the foundation for the overall air-fuel mixture that the engine will use for combustion. This precision is essential because it directly influences engine performance, efficiency, and emissions. While controlling the air-fuel mixture is also a critical aspect of the overall fuel injection system, it is not the direct function of the fuel metering section itself. Enhancing fuel atomization and maintaining constant fuel pressure are also important processes within the fuel injection system, but they pertain to different sections or components than the fuel metering section specifically. Thus, the metering section's focus on the flow of fuel to the flow divider is key to its role in effective engine operation.