If the CAD shows 000 for a supply tank, what does this indicate?

• A. Low fuel
• B. Tank empty
• C. F QTY Fail
• D. System OK

Answer: (C)

When the CAD shows 000 for a supply tank, the reading is indicating a failure in the fuel quantity measurement rather than the tank being physically empty. In this context, 000 is treated as a fault code for the quantity sensor/transmitter (F QTY Fail), meaning the system cannot determine the actual amount of fuel due to a sensor or transmitter issue, not because the tank has no fuel.

This is different from a true low fuel or tank empty condition, which would usually trigger a specific alert or a different display state that reflects the actual quantity once the sensor is functioning. It’s also not considered system OK, because a valid, trustworthy reading is not available.

So, the correct interpretation is that the fuel quantity measurement has failed, and you’d troubleshoot the sensor, wiring, power supply, or transmitter to restore normal measurement.