Where is a fuel shut off valve usually fitted?

• A. Location prior to the firewall
• B. Near the engine
• C. Inside the fuel tank
• D. In the cockpit

Answer: (A)

The main idea here is that you want to be able to stop fuel to the engine quickly and reliably in an emergency. Placing the shut-off valve on the fuel line ahead of the firewall—on the engine side of the firewall—lets you isolate the engine’s fuel supply from the tanks. If a fire or damage occurs, you can shut off fuel before it reaches the engine area and before fuel has to cross the firewall, helping to prevent feeding a fire and reducing risk to the cockpit side. This location also keeps the valve in a protected, maintainable section of the aircraft rather than inside a tank or in a less accessible cockpit area. The other locations would either be impractical for effective shutoff or expose the cockpit to fuel risks, so they’re not preferred.