Here's the procedure:
1. Disconnect the Battery: This is crucial for safety. Disconnect the negative (-) terminal first. This will prevent the fuel pump from running.
2. Locate the Fuel Pump Access: On a 2003 Grand Prix, the fuel pump access is usually through a trapdoor in the trunk. You may need to remove some interior trim panels to reach it. Consult your repair manual for the exact location and process; it will show how to remove any necessary panels and potentially the rear seat bottom cushion to gain better access.
3. Remove the Fuel Pump Access Cover: Once you locate the access panel, carefully remove it. You may find a retaining ring or clips that need to be released.
4. Disconnect the Fuel Pump Electrical Connector: Locate the electrical connector that supplies power to the fuel pump. Carefully disconnect it.
5. Disconnect the Fuel Lines (If Necessary): Some models might require disconnecting the fuel lines connected to the pump, although this is *not always necessary*. If you need to disconnect them, ensure you have the correct fittings and tools. Be prepared for a small amount of fuel spillage; have absorbent materials ready.
6. Remove the Fuel Pump: Once the connector(s) are disconnected, you can usually lift the fuel pump assembly out of the tank. This might involve a retaining ring or a special tool to release the pump. Your repair manual will guide you on this.
7. Install the New Fuel Pump: Reverse the removal process. Ensure the new fuel pump's electrical connector is properly seated and the fuel lines are securely connected (if disconnected).
8. Reconnect the Battery: Reconnect the battery's positive (+) terminal after everything is reassembled.
9. Prime the Fuel System (Important): After reconnecting the battery, you might need to turn the ignition key to the "ON" position (don't crank the engine) for several seconds to prime the fuel system. This allows the pump to fill the lines. Check your repair manual for specific instructions.
Important Notes:
* Repair Manual: A repair manual specific to your 2003 Pontiac Grand Prix 3.8L is highly recommended. It will provide detailed diagrams and instructions for accessing the fuel pump and completing the repair safely.
* Safety: Work in a well-ventilated area to avoid inhaling fuel fumes. Fuel is flammable and explosive, so keep away from open flames or sparks. Wear safety glasses and gloves.
* Fuel Spillage: Be prepared for some fuel spillage. Have rags or absorbent material readily available to clean up any spills.
Do not attempt this repair if you are not comfortable working with automotive systems. If unsure, consult a qualified mechanic.
