Here's a general outline of the process. Specific steps and locations may vary slightly depending on your exact engine and fuel system configuration. Always consult a repair manual specific to your 1991 Buick Century for detailed diagrams and instructions:
1. Safety First:
* Disconnect the battery: This is paramount to prevent sparks that could ignite fuel vapors. Disconnect both the negative (-) and positive (+) terminals.
* Ventilate the area: Work in a well-ventilated area to dissipate any fuel vapors.
* Wear safety glasses and gloves: Protect yourself from potential fuel spills and sharp objects.
* Have a fire extinguisher readily available: Safety first!
2. Preparation:
* Gather your tools: You'll need a socket set, wrenches, screwdrivers (possibly Torx), a fuel pump removal tool (often specialized), possibly a fuel line disconnect tool, jack stands, jack, and possibly a fuel pressure gauge to verify the system after installation. A repair manual will list the specific tools needed.
* Locate the fuel pump: This is usually located inside the fuel tank. You'll likely need to access it from underneath the car.
* Consult your repair manual: Find the specific location and procedures for your car's model. This step is crucial to avoid mistakes.
3. Fuel Pump Removal (if replacing):
* Lower the fuel tank: This usually involves loosening the fuel tank straps and carefully lowering the tank using a jack. Support the tank properly to avoid damage.
* Access the fuel pump: Once the tank is lowered enough, you'll be able to access the fuel pump access panel or the pump itself.
* Disconnect the electrical connector: Carefully disconnect the electrical connector from the fuel pump.
* Disconnect the fuel lines: Carefully disconnect the fuel lines using appropriate tools. You'll likely need to clamp off the lines to prevent fuel spillage.
* Remove the fuel pump: Using the fuel pump removal tool, carefully remove the fuel pump assembly from the tank.
4. Fuel Pump Installation (if replacing):
* Install the new fuel pump: Reverse the removal process. Ensure the new pump is properly seated and the gasket is in place.
* Connect the fuel lines: Carefully reconnect the fuel lines, ensuring a tight seal.
* Connect the electrical connector: Securely connect the electrical connector to the new fuel pump.
* Raise the fuel tank: Carefully raise the fuel tank back to its original position and secure the straps.
5. Testing:
* Reconnect the battery: Reconnect the battery terminals.
* Check for leaks: Carefully inspect the fuel lines and connections for any leaks.
* Start the engine: Start the engine and let it run for a few minutes to check for proper fuel pressure and operation.
* Verify fuel pressure (optional): Using a fuel pressure gauge, verify the fuel pressure is within the specifications outlined in your repair manual.
Important Considerations:
* Fuel pressure: Incorrect fuel pressure can damage the engine. Consult your repair manual for the correct specifications.
* Fuel tank vent: Ensure the fuel tank vent is clear and not obstructed.
* Fuel filter: Consider replacing the fuel filter while you're working on the fuel system.
Again, this is a general overview. A detailed repair manual specific to your 1991 Buick Century is absolutely essential for a safe and successful fuel pump replacement. If you are not comfortable performing this repair yourself, please seek professional help from a qualified mechanic.
