Mercury F77Z-9275-CA Sender Assembly

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Raise the vehicle and support it securely on jackstands. Disconnect the fuel pump/sending unit electrical connector. On models through 2000, the fuel pump/sending unit electrical connector is attached to the left frame rail. Position the ohmmeter probes into the electrical connector and check the resistance. Using an ohmmeter, probe the terminals of the fuel level sensor connector to check the resistance. Use the 200-ohm scale on the ohmmeter. With the fuel tank completely full, the resistance should be about 160.0 ohms. With the fuel tank nearly empty, the resistance of the fuel level sensor should be about 15.0 ohms. If the readings are incorrect, replace the fuel level sensor. A more accurate check of the fuel level sensor can be made by removing it from the fuel tank and checking its resistance while manually operating the float arm. A more accurate check of the fuel level sensor can be performed with the assembly on the bench. Connect the ohmmeter probes to the connector and check the resistance of the fuel level sensor with the float positioned on "empty" and ''full". Check for a smooth change in resistance as the float is moved between the positions. Remove the fuel tank. Remove the fuel pump module from the fuel tank. Remove the fuel level sensor mounting bolt(s) and electrical connectors from the fuel pump module. Installation is the reverse of removal.

If the readings are incorrect, replace the sending unit. A more accurate check can be made by removing it from the fuel tank and checking its resistance while manually operating the float arm.