What action is required when fueling a placarded vehicle?

What action is required when fueling a placarded vehicle?

• A. Keep the engine running to monitor fuel flow
• B. Shut off the engine
• C. Disable the fuel pump alert system
• D. No special action is required

Answer: (B)

When fueling a placarded vehicle, you must shut off the engine. Placards indicate hazardous materials, and you want to eliminate potential ignition sources around fueled vapors. An engine running can produce sparks or heat from electrical systems, hot exhaust, or moving parts, which could ignite flammable vapors. Turning the engine off reduces that risk and is a standard safety requirement in hazmat fueling. The other options aren’t appropriate because keeping the engine running, disabling safety alerts, or doing nothing would leave ignition sources present and ignore the hazards indicated by the placard.

When fueling a placarded vehicle, you must shut off the engine. Placards indicate hazardous materials, and you want to eliminate potential ignition sources around fueled vapors. An engine running can produce sparks or heat from electrical systems, hot exhaust, or moving parts, which could ignite flammable vapors. Turning the engine off reduces that risk and is a standard safety requirement in hazmat fueling. The other options aren’t appropriate because keeping the engine running, disabling safety alerts, or doing nothing would leave ignition sources present and ignore the hazards indicated by the placard.