why is my Ford Mustang S550 (2015-2023) fuel gauge not working

Solution

1. Preparation

• Gather necessary tools and parts before starting the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Tools Required: Socket set, multimeter, OBD-II scanner, wiring diagram.

2. Inspect Wiring and Connectors

• Remove any panels or covers necessary to access the fuel gauge wiring.
• Inspect all wiring and connectors related to the fuel gauge for damage.
• Clean any corroded connectors with electrical contact cleaner.
• Repair or replace any damaged wiring as needed.

3. Test Fuel Level Sending Unit

• Remove the fuel pump access panel in the trunk or under the rear seat.
• Disconnect the wiring harness from the fuel level sending unit.
• Using a multimeter, measure the resistance of the sending unit; it should vary as the float moves.
• If the resistance is out of specification, replace the fuel level sending unit.

4. Check Instrument Cluster

• If the sending unit is functioning, reconnect it and perform a self-test on the instrument cluster using the OBD-II scanner.
• If the gauge does not respond, the instrument cluster may need replacement.

5. Reassembly and Testing

• Reassemble any panels removed during inspection and testing.
• Reconnect the negative battery terminal.
• Start the vehicle and check if the fuel gauge operates correctly.