What is the function of control valves in fuel systems?

• A. Regulate temperature
• B. Measure fuel level
• C. Open and close to direct fuel flow
• D. Initiate shutdown

Answer: (C)

In fuel systems, control valves are the devices that open and close to direct fuel flow. They respond to control signals from the engine management system and adjust the valve position to regulate how much fuel passes and where it goes—sending fuel to the injectors or routing it to return lines as needed. This precise control is what enables accurate metering and stable system pressure.

They aren’t primarily responsible for regulating temperature or measuring fuel level, which are handled by other components. And while a valve may be involved in a safety shutdown in some designs, the core function here is opening and closing to direct fuel flow.