Here's a general overview. This is not a substitute for a professional repair manual specific to your vehicle. Always consult a repair manual for detailed instructions, diagrams, and torque specifications.
Safety Precautions:
* Disconnect the negative battery terminal before starting any work.
* Work in a well-ventilated area. Gasoline fumes are extremely flammable and dangerous.
* Use appropriate safety glasses and gloves.
* Have a fire extinguisher readily available.
* Consider using a fuel siphon to remove as much fuel from the tank as possible before proceeding. This significantly reduces the risk of spillage. This step is HIGHLY recommended.
General Steps:
1. Prepare the vehicle: Park on a level surface, engage the parking brake, and allow the engine to cool completely.
2. Access the fuel tank: This usually involves removing the rear seat, accessing a panel below the rear seat, or potentially even lowering the fuel tank (depending on the Impala's configuration – this is the more difficult option). Your repair manual will show you the proper access point.
3. Disconnect the fuel lines (IF NECESSARY): If you need to lower the fuel tank, you MUST disconnect the fuel lines. This is incredibly important and dangerous if done incorrectly. You'll need to carefully relieve pressure in the fuel lines (consult your repair manual for the correct procedure) and use fuel line disconnect tools to avoid spillage. Never use a hammer or other damaging tools.
4. Disconnect the electrical connector: Unplug the electrical connector from the fuel level sensor.
5. Remove the fuel level sensor: This usually involves unbolting the sensor from the top of the fuel tank. The sensor may be held in place by screws or a retaining ring. Again, your repair manual is crucial here.
6. Install the new fuel level sensor: Carefully insert the new fuel level sensor, making sure it seats correctly. Bolt it securely in place.
7. Reconnect the electrical connector: Make sure it's firmly connected.
8. Reconnect the fuel lines (IF NECESSARY): If you disconnected fuel lines, carefully reconnect them, ensuring tight and secure connections.
9. Reassemble everything: Put back the fuel tank (if removed), access panels, and rear seat.
10. Reconnect the negative battery terminal.
11. Test the new fuel level sensor: Start the engine and check the fuel gauge to ensure it's functioning correctly.
Important Considerations:
* Repair Manual: Obtaining a repair manual specific to your 2002 Chevrolet Impala is absolutely essential. This will provide detailed, illustrated instructions, torque specifications, and safety precautions.
* Difficulty: This repair can range from moderately difficult to very difficult, depending on your access to the fuel pump/sensor. Lowering the fuel tank is a significant undertaking.
* Professional Help: If you're not comfortable working on vehicles, or if you're unsure about any step, it's best to take your Impala to a qualified mechanic. Working with fuel is inherently risky.
Remember, safety is your top priority. If you're not completely confident in your ability to perform this repair safely, seek professional assistance. A mistake could result in injury or fire.
