1. Make sure the vehicle has enough fuel in the tank.
2. Disconnect the negative terminal of the battery to ensure electrical safety during the replacement process.
3. Locate the fuel tank on the underside of the vehicle.
4. Find and remove the access cover or inspection plate for the fuel pump module, typically located on the top of the fuel tank. It may be secured by bolts or screws.
5. Disconnect the electrical connector and fuel lines connected to the fuel pump module. Be cautious as fuel can leak during this step.
6. Release the locking mechanism or retainer that holds the fuel pump module in place.
7. Carefully remove the fuel pump module by lifting it straight up and out of the fuel tank.
8. Inspect the fuel pump, strainer, and fuel level sender unit for wear, damage, or clogging.
9. If replacing only the fuel pump, transfer the fuel level sender unit and other necessary parts from the old pump to the new one.
10. Install the new fuel pump module, ensuring that the fuel level sender unit is properly positioned and the electrical connector and fuel lines are properly attached.
11. Secure the fuel pump module and replace the access cover or inspection plate.
12. Reconnect the negative battery terminal.
13. Turn on the ignition (without starting the engine) to allow the fuel pump to pressurize the fuel system.
14. Start the vehicle and check for any leaks or issues.
Please note that the exact steps may vary based on the specific model of the 2005 Pontiac Sunfire. It's recommended to refer to your vehicle's service manual or consult a professional mechanic for accurate instructions. Additionally, take precautions and follow safety guidelines while working around the fuel system, as it involves flammable materials.
