How many fuel probes are installed in the center tank?

• A. Three
• B. Six
• C. One
• D. Four

Answer: (A)

Understanding how fuel quantity is measured in the center tank helps explain why three probes are used. These probes are capacitance sensors that detect the difference between fuel and air. By placing probes at different heights, the system can gauge the fuel level across the entire tank and provide a reliable total quantity reading even if the fuel is sloshing. Having three probes gives both full vertical coverage and redundancy: if one probe drifts or temporarily fails, the other two maintain an accurate indication and the system can cross-check the readings. A single probe wouldn’t capture the full range, while more probes add unnecessary complexity for this tank configuration. So, the center tank uses three fuel probes to balance accuracy, reliability, and simplicity.