What is the function of metering in fuel delivery?

• A. The accurate measurement of fuel so that the same amount of fuel is delivered to each cylinder for each power stroke.
• B. Ensures the engine can operate at uniform power output.
• C. Both A and B.
• D. None of the above.

Answer: (C)

Metering in fuel delivery is about controlling the exact amount of fuel the engine receives. That precision ensures the same quantity reaches each cylinder on every power stroke, producing balanced, even combustion. With accurate metering, the engine can run with a steady, uniform power output across all cylinders. In practice, metering maintains the correct air–fuel ratio under all operating conditions, which also helps efficiency and emissions. In older carbureted systems, this is done with calibrated jets and circuits; in modern systems, the ECU adjusts injector fuel quantity in real time based on sensor data. Both aspects—equal fueling per cylinder and stable power output—are the essence of metering.