Fuel level sensor is commonly known as fuel gauge. It is a contrivance that helps the motorist in monitoring the fuel consumption and determining when to refill the gas tank. It has a sensing system and an indicator. If it fails, the fuel gauge will behave erratically. Sometimes, the gauge might get stuck on empty or on full. If you suspect your vehicle’s fuel level sensor is faulty, then consult a versed car technician and do necessary inspections to know whether the sending unit needs replacement or not. It is recommended to do complete testing as it is the logical approach to avoid unnecessary hassles.