Main Fuel Gauge Sender

Using an ohmmeter, measure the resistance between terminals 1 and 3 of sender connector (A) at each float level.

Fig 1: Measuring Resistance Between Terminals Sender Connector
Courtesy of HYUNDAI MOTOR CO.

Also check that the resistance changes smoothly when the float is moved from "E" to "F"

FLOAT POSITION AND RESISTANCE CHART - MAIN FUEL GAUGE SENDER

If the height resistance is unsatisfied, replace the fuel sender as an assembly.
CAUTION: After completing this test, wipe the sender dry and reinstall it in the fuel tank.