how to fix the fuel gauge issue on my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather necessary tools and parts listed below.
• Disconnect the vehicle's battery to prevent electrical shocks.

2. Access Fuel Level Sensor

• Tools Needed: Socket set, ratchet, screwdriver
• Lift the vehicle using a jack and secure it with jack stands.
• Remove the rear seat or access panel to gain access to the fuel pump assembly.
• Disconnect any electrical connectors and fuel lines carefully to prevent leaks.

3. Remove Fuel Pump Assembly

• Unscrew the retaining ring that holds the fuel pump assembly in place.
• Gently lift the assembly out of the tank, ensuring not to damage the fuel level sensor.

4. Inspect and Replace Fuel Level Sensor

• Tools Needed: Multimeter, replacement fuel level sensor (if necessary)
• Visually inspect the fuel level sensor for damage or wear.
• If faulty, disconnect the old sensor and connect the new one in place.
• Ensure all seals are intact to prevent future leaks.

5. Reassemble and Test

• Reinstall the fuel pump assembly into the tank and secure it with the retaining ring.
• Reconnect any disconnected electrical connectors and fuel lines.
• Replace the access panel or rear seat.
• Reconnect the vehicle's battery.