Here's a general outline of the process. Specific steps and locations may vary slightly depending on the engine type (3.1L V6 or 3.8L V6). Consult a repair manual specific to your 1996 Buick Century for detailed instructions and diagrams. A Haynes or Chilton manual is a good investment for this kind of work.
Safety First!
* Disconnect the negative battery cable before starting any work. This prevents accidental sparks that could ignite fuel vapors.
* Work in a well-ventilated area. Fuel vapors are highly flammable and dangerous.
* Wear safety glasses and gloves.
* Have a fire extinguisher readily available.
Steps (General Outline):
1. Vehicle Preparation:
* Secure the vehicle on level ground and engage the parking brake.
* Locate the fuel pump access panel. This is usually located under the rear seat (might require removing the seat or sections of it) or sometimes under the car, near the fuel tank. Consult your repair manual for the exact location.
2. Fuel System Depressurization:
* This is extremely important: The fuel system needs to be depressurized to prevent fuel from spraying out when you disconnect lines. Run the engine until it stalls (this uses up fuel pressure). Some vehicles have a fuel pressure relief valve you can manually depress; check your repair manual.
3. Accessing the Fuel Pump:
* Remove the access panel (might involve removing screws, bolts, or clips).
* You'll likely see the fuel pump assembly, which might be held down by a retaining ring or bolts.
4. Disconnecting Fuel Lines and Electrical Connections:
* Carefully disconnect the fuel lines. They may have quick-connect fittings or require using a fuel line disconnect tool. Have rags ready to absorb any spilled fuel.
* Disconnect the electrical connector to the fuel pump.
5. Removing the Fuel Pump Assembly:
* Carefully remove the retaining ring or bolts securing the fuel pump assembly to the tank. You might need to use a special tool for the retaining ring.
* Lift out the entire fuel pump assembly. Be careful not to damage the fuel level sending unit (part of the assembly).
6. Installing the New Fuel Pump:
* Carefully compare the old and new fuel pump assemblies to ensure they are identical.
* Install the new fuel pump assembly, reversing the removal steps. Make sure the fuel level sending unit is properly seated.
* Secure the fuel pump assembly with the retaining ring or bolts.
7. Reconnecting Fuel Lines and Electrical Connections:
* Carefully reconnect the electrical connector to the fuel pump.
* Carefully reconnect the fuel lines, ensuring a tight seal.
8. Reinstalling the Access Panel:
* Reinstall the access panel.
9. Checking for Leaks:
* Before starting the car, carefully inspect all connections for leaks. Wipe up any spilled fuel.
10. Reconnect the Battery and Test:
* Reconnect the negative battery cable.
* Start the engine and check for any leaks or unusual noises from the fuel system. Let the engine run for a few minutes.
Important Considerations:
* Fuel pump replacement kits: Often, it's better to buy a complete fuel pump assembly rather than just the pump itself. This will include the necessary seals, gaskets, and sending unit.
* Fuel tank sealant: If you have to remove the entire fuel tank, consider using a fuel tank sealant on the gasket to prevent future leaks.
This is a simplified overview. Always consult your vehicle's repair manual for detailed, model-specific instructions. Failure to follow the correct procedures can lead to injury, damage to your vehicle, or fire. If you are unsure about any step, seek professional help.
