fuel gage on 2004 Chevrolet Malibu

My fuel gage needle does not work. Tank is full but it is registering low fuel. Car has low mileage (42,000) what is the problem?

Asked by for the 2004 Chevrolet Malibu
This is often due to a faulty fuel sending unit, which measures the fill level at the tank and send it to the gauge.
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