Fuel Sender

Using an ohmmeter, measure the resistance between terminals 2 and 3 at each float level.
CAUTION:
- Reversing the connections of the tachometer will damage the transistor and diodes inside.
- When removing or installing the tachometer, be careful not to drop it or subject it to severe shock.
Fig 1: Testing Fuel Sender Operation
Courtesy of KIA MOTORS AMERICA, INC.
Also check that the resistance changes smoothly when the float is moved from "E" to "F".

Fig 2: Fuel Sender Resistance Chart
Courtesy of KIA MOTORS AMERICA, INC.
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.