What is the key purpose of metering in fuel injection?

The key purpose of metering in fuel injection is to measure the precise amount of fuel to be injected into the engine's combustion chamber. This precision is critical because the correct fuel-to-air ratio is essential for optimal engine performance, efficiency, and emissions control. If too little fuel is injected, the engine may run lean, leading to poor performance and potential damage. Conversely, injecting too much fuel can result in a rich mixture, which can cause increased emissions and reduced efficiency.

Metering ensures that the fuel system delivers just the right amount of fuel at the correct timing relative to the engine's operational conditions. By accurately controlling fuel flow, metering contributes to smooth engine operation, better fuel efficiency, and compliance with emission standards. Other options do relate to fuel management and engine performance but don't specifically reflect the primary purpose of metering in the fuel injection process.