how to fix the fuel tank issue in my GMC Sierra T1XX (2019-Present)

Learn how to diagnose and fix P0463 fuel level sensor issues in GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Tools Required: Socket set, torque wrench, fuel line disconnect tool, OBD-II scanner, multimeter, safety glasses, gloves, drip pan.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Remove the Fuel Tank

• Sub-steps:
  1. Safely lift the vehicle using jack stands.
  2. Drain the fuel tank using a siphon pump or by removing the drain plug if equipped.
  3. Disconnect the fuel lines using a fuel line disconnect tool.
  4. Remove the bolts securing the fuel tank straps, then lower the tank carefully.
  5. Disconnect any electrical connectors associated with the fuel pump or fuel level sensor.

3. Inspect and Repair

• Sub-steps:
  1. Inspect the fuel tank for cracks or damage; replace if necessary.
  2. Examine the fuel lines for leaks or wear; replace any damaged lines.
  3. Check the fuel filler neck for blockages or breaks; clean or replace as needed.
  4. Test the fuel level sensor with a multimeter for resistance; replace if faulty.

4. Reassemble

• Sub-steps:
  1. Install the fuel pump and fuel level sensor back into the tank (if removed).
  2. Reinstall the fuel tank by reversing the removal steps, ensuring all connections are secure.
  3. Reconnect fuel lines and ensure no leaks are present.
  4. Reconnect the battery.

5. Test the Repair

• Sub-steps:
  1. Start the engine and check for leaks around the fuel tank and lines.
  2. Test the fuel gauge and ensure it reads accurately.
  3. Take the vehicle for a test drive to confirm performance.