Q: How to replace the fuel level sending unit on Lincoln Navigator?
A: To replace the fuel level sensor, start by raising the vehicle and supporting it securely on jackstands. Disconnect the electrical connector for the fuel level sensor. Position the ohmmeter probes into the electrical connector and check the resistance using the 200-ohm scale on the ohmmeter. With the Fuel Tank completely full, the resistance should be about 160.0 ohms, and with the fuel tank nearly empty, the resistance should be about 15.0 ohms. If the readings are incorrect, replace the sensor. For a more accurate check, remove the sensor from the fuel tank and check its resistance while manually operating the float arm. To replace the sensor, remove the fuel tank and the Fuel Pump assembly mounting screws or threaded retainer. Carefully angle the fuel pump/fuel level sensor out of the opening without damaging the fuel level float. Remove the mounting bolt and harness connectors. Installation is the reverse of removal, and be sure to install a new rubber gasket.