What Causes the Fuel Gauge Needle to Stay at Full After Refueling?

[StNaomi]

When the fuel gauge displays a full state for an extended period, it could indicate a malfunction in the fuel level sensor, preventing it from reading accurate tank data. Here is relevant information about automotive fuel gauges: 1. Introduction: The vehicle fuel gauge is designed based on principles of physical mechanics and electronics. Mechanically, it determines the fuel level scale position in the tank using buoyancy theory (somewhat similar to a household toilet tank), then transmits this value to a rheostat via a sensor. By sliding on the rheostat, different voltage values are obtained, which are then converted into the scale seen on the fuel gauge. 2. Types: There are two types of fuel gauges currently used in vehicles: analog (pointer-type) and digital.