Here's a general outline; specifics might vary slightly depending on your exact model and trim level:
1. Preparation:
* Safety First: Disconnect the negative battery cable. Work in a well-ventilated area. Have fire extinguisher handy.
* Gather Tools: You'll need various sockets (likely metric), wrenches, screwdrivers (Phillips and possibly flathead), a fuel line disconnect tool (essential to avoid leaks), a torque wrench (for proper tightening), jack stands (crucial!), jack, possibly a fuel pump removal tool (depending on access), rags, and a container to catch spilled fuel. Consult a repair manual for the specific socket sizes.
* Consult a Repair Manual: A repair manual specific to your 1997 Oldsmobile Aurora is invaluable. It will provide detailed diagrams, torque specifications, and crucial steps you might miss in a general guide. Chilton and Haynes are popular options.
* Personal Protective Equipment (PPE): Wear safety glasses, gloves, and old clothes.
2. Accessing the Fuel Tank:
* Lower the Fuel Level: Before you begin, drive the car until the fuel gauge shows nearly empty. This significantly reduces the amount of fuel you'll need to deal with.
* Raise and Secure the Vehicle: Safely jack up the rear of the vehicle and securely support it with jack stands. Never work under a vehicle supported only by a jack.
* Locate the Fuel Tank: The fuel tank is typically located under the rear passenger compartment or in the trunk area. Access might require removing some interior trim panels or underbody panels. Your repair manual will show you exactly where it is.
3. Removing the Fuel Sending Unit:
* Disconnect Fuel Lines: Carefully disconnect the fuel lines from the fuel pump. This is where the fuel line disconnect tool is crucial. There will likely be at least one fuel supply line and one return line. Clamp off the lines before disconnecting to minimize fuel spillage.
* Disconnect Electrical Connectors: Disconnect the electrical connector(s) leading to the fuel sending unit.
* Remove Access Panel/Cover: There's usually a removable access panel or cover on top of the fuel tank to reach the fuel sending unit. You may need to remove bolts or clips.
* Remove the Fuel Sending Unit: This step often involves carefully removing retaining bolts or clips that hold the sending unit in place. This can be tricky and may require patience and the correct tools. The unit is often held by a retaining ring, which needs to be carefully worked loose.
* Remove Fuel Pump (Possibly): On some models, the fuel pump and sending unit are a single assembly. If this is the case, they are removed together.
4. Installing the New Fuel Sending Unit:
* Install the New Unit: Carefully install the new fuel sending unit, ensuring it's properly seated and aligned.
* Reattach Fuel Lines: Reconnect the fuel lines securely, taking care to avoid leaks. Tighten connections to manufacturer's specifications.
* Reconnect Electrical Connectors: Reattach the electrical connectors.
* Replace Access Panel/Cover: Securely reattach any access panels or covers you removed.
5. Final Steps:
* Lower the Vehicle: Carefully lower the vehicle using the jack.
* Reconnect the Battery: Reconnect the negative battery cable.
* Check for Leaks: Inspect all fuel connections for leaks.
* Start the Vehicle: Start the vehicle and check the fuel gauge to ensure it's functioning correctly.
Important Considerations:
* Fuel System Pressure: The fuel system will be under pressure. Take precautions to avoid injury.
* Static Electricity: Static discharge can ignite fuel vapors. Take appropriate precautions to prevent static build-up.
* Professional Help: If you're not comfortable performing this repair, it's best to have it done by a qualified mechanic. Improper installation can lead to fuel leaks and fire hazards.
This is a general guide. Always consult a repair manual specific to your 1997 Oldsmobile Aurora for detailed instructions and diagrams before attempting this repair. Remember safety first!
