1. Preparation:
* Safety First: Disconnect the negative battery terminal. This prevents accidental sparking.
* Gather Tools: You'll need a variety of tools, including:
* Socket wrench set (metric)
* Ratchet and extensions
* Screwdrivers (Phillips and flathead)
* Fuel line disconnect tools (important to avoid leaks)
* Pliers
* Torque wrench
* Jack and jack stands (or ramps)
* Shop rags or absorbent material
* Safety glasses and gloves
* Fuel pump replacement kit (includes new pump, filter, and possibly gaskets/o-rings)
* Possibly a fuel pressure gauge (to check pressure after installation)
* Locate the Fuel Pump: On most 2002 Buick Centuries, the fuel pump is located inside the fuel tank. This means you'll have to drop the fuel tank. Consult your repair manual for the exact location and access method.
2. Dropping the Fuel Tank:
* Reduce Fuel Level: This is extremely important for safety. Drain as much fuel as possible from the tank. You can siphon it out or drive the car until the fuel gauge is near empty.
* Disconnect Fuel Lines: Carefully disconnect the fuel lines from the fuel pump assembly. Use the correct fuel line disconnect tools to prevent damage and leaks. Have rags ready to absorb any spilled fuel. Be aware that there will be some residual pressure in the lines.
* Disconnect Electrical Connectors: Disconnect the electrical connector to the fuel pump and the fuel level sender.
* Remove Fuel Tank Straps/Supports: Locate and carefully remove the straps or supports holding the fuel tank in place. These will vary depending on the car's model.
* Lower the Fuel Tank: Gently lower the fuel tank. It's usually heavy, so be cautious. You may need a helper.
3. Replacing the Fuel Pump:
* Access the Fuel Pump: Once the tank is lowered sufficiently, you should be able to access the fuel pump assembly. It's usually held in place by a retaining ring or bolts.
* Remove the Old Fuel Pump: Remove the retaining ring or bolts, carefully removing the old fuel pump assembly from the tank.
* Install the New Fuel Pump: Install the new fuel pump assembly, making sure everything is properly seated and secured.
* Reinstall the Fuel Tank: Carefully raise the fuel tank back into position and reattach the straps/supports.
4. Reconnecting and Testing:
* Reconnect Fuel Lines: Carefully reconnect the fuel lines, ensuring a tight seal.
* Reconnect Electrical Connectors: Reconnect the electrical connector to the fuel pump and fuel level sender.
* Reconnect Battery: Reconnect the negative battery terminal.
* Check for Leaks: Carefully inspect all fuel lines and connections for leaks.
* Start the Engine: Start the engine and check for any problems. Listen for unusual noises from the fuel pump.
* Check Fuel Pressure (Optional): If you have a fuel pressure gauge, check the fuel pressure to ensure it's within specifications.
Important Considerations:
* Repair Manual: A repair manual specific to your 2002 Buick Century Custom is crucial. It will provide detailed diagrams and instructions.
* Fuel Safety: Always prioritize safety when working with fuel. Work in a well-ventilated area, away from open flames or sparks.
* Professional Help: If you're not comfortable performing this repair yourself, it's best to take your car to a qualified mechanic. Incorrect installation can lead to serious problems.
This is a simplified overview. Again, consulting a repair manual specific to your vehicle is essential for a successful and safe repair. Improper fuel pump installation can be dangerous, so proceed with caution and don't hesitate to seek professional help if needed.
