Red Seal Agricultural Equipment Technician Practice Exam

What is the main purpose of a fuel injection system?

1. To serve as a fuel filter

2. To deliver fuel in precise amounts

3. To cool the combustion chamber

4. To mix air and fuel

The correct answer is: To deliver fuel in precise amounts

The main purpose of a fuel injection system is to deliver fuel in precise amounts to the engine's combustion chamber. This accuracy is crucial for optimizing engine performance, efficiency, and emissions. By controlling the amount of fuel injected based on various engine conditions, the fuel injection system ensures that the air-fuel mixture is ideal for combustion, maximizing power output while minimizing waste and pollutants. Accurate fuel delivery allows for better engine response and reduces the likelihood of issues related to too rich or too lean air-fuel mixtures, which can lead to poor performance and increased exhaust emissions. In modern engines, fuel injection systems also adjust for factors such as temperature and engine load, contributing to overall engine longevity and reliability.