Low Fuel Level Light Sensor: Sonata

Remove sending unit from fuel tank. Connect a 12-volt test light (with 3.4-watt bulb installed) between a 12-volt battery source and terminal No. 1 of fuel gauge sending unit connector. SeeFigure . Using jumper wire, ground connector terminal No. 2 to battery negative terminal.
Immerse sending unit in water. Test light should be off while the sensor is beneath the water and should illuminate when sensor and sending unit is taken out of water. If sensor/sending unit does not operate as specified, replace sending unit assembly.