Which valve is primarily responsible for metering fuel into the nozzle lines?

• A. Shut-off Valve
• B. Metering Valve
• C. Bypass Valve
• D. Main Bypass

Answer: (B)

The main idea is that the metering valve controls the exact amount of fuel that gets into the nozzle lines. It sits in the metering path and adjusts its opening to set the flow rate, creating the right pressure drop so the nozzle lines receive the correct fuel quantity for the engine’s current needs. When more fuel is required, the valve opens more; when less is needed, it closes a bit to reduce flow. The shut-off valve is mainly for stopping fuel flow when the system is shut down, not for metering during normal operation. Bypass valves provide alternative routes for fuel, bypassing the metering path under certain conditions, so they don’t regulate the amount entering the nozzle lines on a continuous basis.