What is the role of the fuel injector in a diesel engine?

• A. To create a fuel-air mixture at low pressure
• B. To deliver fuel into the combustion chamber at high pressure
• C. To filter debris from the fuel
• D. To regulate fuel temperature

Answer: (B)

The role of the fuel injector in a diesel engine is primarily to deliver fuel into the combustion chamber at high pressure. This is crucial because a diesel engine operates on the principle of compression ignition, where the fuel is injected directly into the highly compressed, hot air in the combustion chamber. The injector must atomize the fuel effectively, ensuring that it mixes well with the air in order to facilitate efficient combustion.

By delivering fuel at high pressure, the injector ensures that the fuel is finely atomized, which promotes better combustion and power generation. The accuracy and timing of the fuel delivery directly impact the engine's performance, emissions, and fuel efficiency. As a result, proper functioning of the fuel injector is vital for the overall performance of a diesel engine, making this role critical in ensuring that the engine runs smoothly and efficiently.