Here's a general overview of the process. Do not attempt this without proper safety precautions and mechanical knowledge.
1. Safety First: Disconnect the negative battery terminal. This prevents accidental sparks. Work in a well-ventilated area, away from open flames and sparks. Have a fire extinguisher readily available. Use appropriate safety glasses and gloves.
2. Vehicle Preparation: The car will likely need to be raised safely on jack stands. Consult your owner's manual for proper jack points. Never work under a vehicle supported only by a jack.
3. Fuel Tank Removal: This usually involves:
* Removing the fuel filler neck: This might require removing some interior trim pieces in the trunk.
* Disconnecting the fuel lines: This is crucial and requires careful attention to avoid fuel spillage. You'll need fuel line disconnect tools to safely release the clamps. You might also need to relieve fuel pressure in the system (consult a repair manual for your specific model).
* Disconnecting the electrical connector: The fuel pump has a wiring harness connector.
* Detaching the fuel tank straps: These straps hold the fuel tank in place. You'll need to loosen and remove these bolts or clips.
* Lowering the fuel tank: Carefully lower the fuel tank. This often involves using a fuel tank strap wrench or similar tool to support the tank's weight as you lower it.
4. Accessing the Fuel Pump: Once the tank is lowered (or even partially lowered depending on access), the fuel pump assembly should be visible. It's typically located inside the fuel tank. You'll need to access the assembly to replace the pump. This will often involve removing the retaining ring and carefully lifting out the assembly.
5. Fuel Pump Replacement: Replace the fuel pump with a new one, ensuring the new pump's orientation matches the old one.
6. Reassembly: Reassemble everything in reverse order, carefully reconnecting fuel lines and the electrical connector. Ensure all the clamps and bolts are properly tightened. Refill the fuel tank.
7. Check for Leaks: After reassembly, carefully check for any fuel leaks around the lines and connections.
Disclaimer: This is a general overview. The specific procedures may vary slightly depending on your exact Malibu model and trim level. Always consult a repair manual specific to your 2003 Chevrolet Malibu for detailed instructions and diagrams. Attempting this repair without the proper knowledge and tools can be dangerous and could result in damage to your vehicle or personal injury. If you're not comfortable with this level of repair, it's strongly recommended you take your vehicle to a qualified mechanic.
