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 1 And 3 Of Sender Connector Using Ohmmeter
Courtesy of HYUNDAI MOTOR CO.

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

Position	Liter (l )	U.S. gal.	Resistance (Ω)
E	6.5	1.71	184 ± 2 Ω
Warning lamp ON	8.5	2.23	170 ± 2 Ω
1/2	28.8	7.6	66 ± 2 Ω
F	50	13.2	15 ± 2 Ω

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.