Here's a general outline. This is not a substitute for a detailed repair manual specific to your vehicle. Always consult a repair manual for precise instructions, torque specifications, and diagrams. Improper procedures could damage your vehicle or cause injury.
Steps:
1. Safety First: Disconnect the negative battery terminal. Allow at least 15 minutes for any residual electrical charge to dissipate.
2. Prepare the Vehicle: The fuel tank will need to be lowered or partially dropped, depending on the Impala's configuration. This usually requires jacking up the car securely, supporting it on jack stands, and removing the rear tires for better access. Consult your repair manual for specific instructions on safely accessing the fuel tank.
3. Drain the Fuel Tank: This is highly recommended. Siphon as much fuel as possible out of the tank into a suitable container. This significantly reduces the risk of spillage and makes the job easier and safer.
4. Disconnect Fuel Lines: Once the tank is accessible, carefully disconnect the fuel lines leading to and from the fuel tank. You'll likely need fuel line disconnect tools to avoid damaging the lines. Be prepared for a small amount of fuel spillage. Use clean rags to absorb any leaks.
5. Disconnect Electrical Connectors: Unplug the electrical connector from the fuel sending unit.
6. Remove the Fuel Sending Unit: The fuel sending unit is typically secured by several bolts or a retaining ring. Remove these fasteners carefully, taking note of their order and placement. The sending unit may be located at the top or side of the tank. Again, your repair manual will give you the exact location and method of removal.
7. Install the New Fuel Sending Unit: Carefully install the new fuel sending unit, ensuring it's properly seated and aligned. Reinstall the fasteners, tightening them to the specified torque.
8. Reconnect Electrical and Fuel Lines: Reconnect the fuel lines, ensuring they are securely fastened. Connect the electrical connector to the new fuel sending unit. Double-check all connections for tightness and security.
9. Refuel the Tank: Carefully pour fuel back into the tank, avoiding overfilling.
10. Reinstall the Fuel Tank: Carefully raise the fuel tank back into its original position. Secure it properly.
11. Reconnect the Battery Terminal: Reconnect the negative battery terminal.
12. Test and Verify: Start the engine and check the fuel gauge to ensure it's functioning correctly. Monitor for any fuel leaks.
Important Considerations:
* Repair Manual: You absolutely need a repair manual specific to your 2002 Chevrolet Impala. This will provide detailed diagrams, torque specifications, and step-by-step instructions.
* Safety: Work in a well-ventilated area. Always wear safety glasses and gloves.
* Tools: You'll need various tools, including a jack, jack stands, fuel line disconnect tools, sockets, wrenches, and possibly a fuel pump removal tool.
* Professional Help: If you're not comfortable performing this repair yourself, consider taking your vehicle to a qualified mechanic. This is a potentially complex repair with safety implications.
This is a simplified overview. Improper installation could lead to serious problems, including fuel leaks and fire hazards. Consult a repair manual and proceed with caution.
