What causes abnormal fuel gauge display in Nissan Sunny?

[DiJeremiah]

Possible reasons for abnormal fuel gauge display in Nissan Sunny include fluctuating needle speed, sudden drop to zero, or rising scale. Below are specific causes and solutions: Fluctuating fuel gauge needle speed: This typically manifests as slow needle movement in the first half of the gauge, followed by rapid drop after passing the midpoint. This fluctuation isn't necessarily a malfunction - it's related to the fuel pump design used to measure fuel levels, which cannot uniformly reflect gasoline consumption. Such consistent variation is difficult to achieve mechanically and cannot be altered through part replacement or repair. Sudden fuel gauge drop to zero: The fuel gauge indication depends on the fuel level sensor. When this occurs, it indicates an issue with the vehicle's fuel level sensor. The problem likely stems from contamination of the fuel level sensor that wasn't cleaned promptly. Gasoline contains numerous impurities, and prolonged immersion of the sensor in fuel leads to contamination, directly affecting indication accuracy.