Which switch is used to shut off the fuel valves in an emergency?

• A. Emer Off Switch
• B. Master Switch
• C. Fuel Shutoff Handle
• D. Main Fuel Shutdown

Answer: (D)

In an emergency, you need a single action that stops fuel flowing to every burner, ensuring an immediate halt to any potential combustion. The Main Fuel Shutdown is the dedicated control designed to isolate the entire fuel supply, so engaging it stops fuel delivery to the entire system and rapidly reduces fire risk. Other controls are not guaranteed to shut off all fuel at once: an emergency stop may affect other systems but not the fuel lines; a master switch typically cuts electrical power, not fuel; and a fuel shutoff handle might only affect a single line or local valve rather than the whole system. So the Main Fuel Shutdown is the proper choice for quickly sealing off the fuel supply in an emergency.