Replacing it is a moderately involved job that requires some mechanical aptitude and safety precautions. Here's a general outline, but always consult a repair manual specific to your 1994 Sunbird 31L for detailed instructions and torque specifications. Improperly performed work could lead to serious injury or damage.
Safety First!
* Disconnect the negative battery terminal before starting any work. This prevents sparks that could ignite fuel vapors.
* Work in a well-ventilated area away from any ignition sources. Fuel vapors are highly flammable.
* Wear safety glasses and gloves.
* Have proper tools and a fire extinguisher nearby.
Steps to replace the fuel pump (general outline):
1. Prepare the vehicle: Secure the vehicle on a level surface, engage the parking brake, and chock the wheels.
2. Drain the fuel tank: This is crucial to minimize the amount of fuel you'll be working around. Use a siphon pump or fuel transfer pump to remove as much fuel as possible. You may need a suitable container to catch the fuel – make sure it's properly labeled and stored safely.
3. Access the fuel tank: This varies depending on the specific model. You will likely need to remove some components to access the tank straps and fuel lines (e.g., exhaust, possibly parts of the undercarriage). Consult your repair manual.
4. Lower the fuel tank: Carefully lower the fuel tank. This usually involves loosening and removing straps or support brackets. Support the tank with jack stands or a suitable hoist to prevent damage.
5. Disconnect fuel lines and electrical connectors: You'll need to disconnect the fuel lines (inlet and outlet) and the electrical connector to the fuel pump. There will likely be clamps that secure these lines. Take care not to spill any remaining fuel.
6. Remove the fuel pump access panel: The fuel pump assembly is typically accessed through a cover on top of the fuel tank. This may involve removing screws or bolts.
7. Remove the fuel pump assembly: Carefully remove the fuel pump assembly from the tank. This usually involves removing retaining clips or bolts. Take note of the positioning of all components before disconnecting.
8. Install the new fuel pump assembly: Install the new fuel pump assembly, ensuring it's correctly seated and all components are in place.
9. Reassemble everything: Reinstall the fuel pump access panel, reconnect the fuel lines and electrical connector, and carefully raise the fuel tank back into place. Secure it with the straps or brackets.
10. Reconnect fuel lines and electrical connectors: Make sure all connections are secure and tight. Double check that you haven't crushed or kinked any lines.
11. Reconnect the negative battery terminal: Once everything is reassembled, reconnect the negative battery terminal.
12. Prime the fuel system: You might need to cycle the ignition switch a few times (without starting the engine) to prime the fuel pump.
13. Check for leaks: Inspect all connections for fuel leaks before starting the engine.
14. Start the engine and check for proper operation: Start the engine and listen for proper fuel pump operation. Check for any leaks or unusual noises.
This is a complex process. If you are not comfortable performing this repair yourself, it's strongly recommended to take your vehicle to a qualified mechanic. They have the experience and tools to safely and efficiently complete the job. Remember to consult a repair manual specific to your vehicle for detailed step-by-step instructions and diagrams.
