Here's a general outline. Specific steps may vary slightly depending on the exact engine and trim level:
1. Preparation:
* Safety First: Work in a well-ventilated area. Have a fire extinguisher readily available. Wear safety glasses and gloves.
* Gather Tools: You'll need a socket set (metric), wrenches, screwdrivers (Phillips and flathead), fuel line disconnect tools, a fuel pump pliers (or similar tool to remove the retaining ring), possibly a fuel pressure gauge, jack stands, a jack, and possibly a fuel pump installation tool (to help lower the pump into the tank). A shop manual specific to your 1996 Buick LeSabre is highly recommended.
* Obtain Parts: Purchase the correct fuel pump assembly for your vehicle. This typically includes the pump, the sending unit (fuel level sensor), and a new fuel filter. It's also a good idea to get new fuel lines o-rings if you plan on disconnecting the lines.
* Drain the fuel tank: This is important to reduce the amount of fuel you'll be working around. You can siphon the fuel out using a siphon pump, or carefully drain it from the tank. Dispose of the fuel properly.
2. Accessing the Fuel Pump:
* Lower the vehicle: Securely lift the rear of the vehicle using a jack and place it on jack stands.
* Locate the access panel: The access panel is usually located under the rear seat or in the trunk, depending on your model. You may need to remove the rear seat bottom cushion and potentially some interior trim panels to access it. Consult your shop manual for the exact location.
* Remove the access panel: This typically involves removing a few screws or bolts.
3. Removing the Fuel Pump Assembly:
* Disconnect the electrical connector: Carefully disconnect the electrical connector from the fuel pump.
* Disconnect the fuel lines: Use fuel line disconnect tools to carefully disconnect the fuel lines from the fuel pump. Be prepared for some fuel spillage. Have rags ready to absorb any leaked fuel.
* Disconnect the fuel level sender: If the fuel level sender is part of the assembly, disconnect it.
* Remove the retaining ring: Using fuel pump pliers, carefully remove the retaining ring that holds the fuel pump assembly in place.
* Remove the fuel pump assembly: Carefully lift the fuel pump assembly out of the tank. This may require some maneuvering.
4. Installing the New Fuel Pump Assembly:
* Install the new fuel pump assembly: Carefully lower the new fuel pump assembly into the tank. This can be tricky, and a fuel pump installation tool can make it easier.
* Reinstall the retaining ring: Securely install the retaining ring.
* Reconnect the fuel level sender: If applicable, reconnect the fuel level sender.
* Reconnect the fuel lines: Carefully reconnect the fuel lines, ensuring a tight seal.
* Reconnect the electrical connector: Connect the electrical connector to the fuel pump.
* Reinstall the access panel: Reinstall the access panel, securing it with the screws or bolts.
* Raise the vehicle: Carefully raise the vehicle using the jack.
5. Post-Installation:
* Reconnect the negative battery cable.
* Check for leaks: Carefully check all connections for leaks.
* Start the engine: Start the engine and check for any unusual noises or leaks.
* Test the fuel gauge: Verify the fuel gauge is working correctly.
Important Considerations:
* Shop Manual: A shop manual specific to your 1996 Buick LeSabre is invaluable. It provides detailed diagrams and instructions.
* Fuel Pressure: If you have a fuel pressure gauge, checking the fuel pressure before and after the replacement is a good idea.
* Professional Help: If you're not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. This is a job with the potential for serious injury or damage if not done correctly.
This is a general guide. Always consult a repair manual specific to your vehicle's year, make, and model for detailed instructions and diagrams. Improperly performing this repair could lead to serious injury or damage. If you are unsure about any step, seek professional help.
