CNG Fleet Management and Driver Operations Flashcards

Before fueling a CNG vehicle, a driver should first verify which condition?

Answer: The vehicle engine is turned off

Drivers must always turn off the engine before fueling a CNG vehicle to prevent ignition of any gas released during nozzle connection.

What does a CNG vehicle's fuel gauge reading in GGE allow fleet managers to determine?

Answer: Estimated driving range compared to an equivalent gasoline vehicle

Displaying fuel in GGE lets drivers and fleet managers estimate range using familiar gasoline consumption benchmarks.

Which pre-trip inspection item is unique to CNG vehicles that gasoline vehicle drivers do not need to perform?

Answer: Visual inspection of CNG cylinders and fuel lines for damage or leaks

CNG drivers must visually inspect high-pressure cylinders and fuel lines for cracks, corrosion, or signs of leakage before each trip.

If a CNG driver smells natural gas inside the vehicle cab while driving, what is the correct immediate action?

Answer: Pull over safely, turn off the engine, exit the vehicle, and call for assistance

A gas odor in the cab indicates a potential leak; the driver must stop immediately, shut off the engine, and evacuate to prevent ignition.

Which document must CNG commercial vehicle operators carry to comply with DOT Hazardous Materials Regulations when transporting CNG as cargo?

Answer: Shipping papers describing the compressed natural gas per 49 CFR Part 172

DOT requires shipping papers describing hazardous materials (including compressed natural gas) when transported as cargo, per 49 CFR Part 172.

What is the purpose of a CNG vehicle's manual fuel shutoff valve, and when should a driver use it?

Answer: It stops fuel flow from the cylinder in an emergency or during maintenance

The manual shutoff valve isolates the CNG cylinder from the fuel system and should be closed during emergencies, accidents, or maintenance.