Safety First:
* Disconnect the negative battery terminal before starting any work on the fuel system.
* Work in a well-ventilated area. Fuel vapors are flammable and potentially explosive.
* Wear safety glasses and gloves.
General Steps (Refer to your repair manual for precise locations and procedures):
1. Vehicle Preparation:
* Secure the vehicle on a level surface.
* Disconnect the negative battery terminal.
* Depending on your Riviera's configuration, you may need to raise the vehicle and support it securely with jack stands. Access may be from underneath.
2. Fuel System Depressurization:
* Run the engine until it stalls to use up the fuel pressure in the lines.
* You may need to use a fuel pressure release tool to further reduce pressure. This step is crucial to prevent fuel spraying.
3. Access the Fuel Pump:
* Locate the fuel pump access panel. This is usually under the rear seat or in the trunk, but your repair manual will pinpoint the exact location. It often involves removing interior trim pieces.
* You may need to remove the fuel tank straps to lower the tank slightly for easier access. This may involve detaching fuel lines and electrical connectors.
4. Disconnect Fuel Lines and Electrical Connectors:
* Carefully disconnect the fuel lines. You may need specialized fuel line disconnect tools to prevent damage. Have rags ready to absorb any spilled fuel.
* Disconnect the electrical connector(s) to the fuel pump.
5. Remove the Fuel Pump Assembly:
* The fuel pump is usually part of a larger assembly that includes the fuel level sending unit. The assembly is usually secured by a retaining ring or bolts. Your repair manual will specify the method.
* Carefully remove the assembly, taking care not to damage any components.
6. Replace the Fuel Pump:
* Install the new fuel pump assembly, ensuring it's properly seated.
* Reinstall the retaining ring or bolts.
7. Reconnect Everything:
* Reconnect the electrical connectors.
* Reconnect the fuel lines, ensuring they are secure.
* Reinstall the fuel tank straps (if removed).
* Reinstall any interior trim pieces.
8. Reconnect Battery and Test:
* Reconnect the negative battery terminal.
* Check for leaks.
* Start the engine and let it run for a few minutes to check for proper operation.
* Monitor the fuel gauge to ensure it's working correctly.
Important Considerations:
* Fuel Pump Priming: Some fuel pumps require priming after installation. Your repair manual will tell you if this is necessary for your model.
* O-rings and Seals: Replace any worn or damaged O-rings and seals during reassembly to prevent leaks.
* Fuel Filter: Consider replacing the fuel filter while you're at it. It's a relatively inexpensive and easy task that can prevent future problems.
This is a complex job with the potential for significant complications if not done correctly. Again, I strongly recommend using a repair manual specific to your 1997 Buick Riviera. If you are not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Improper fuel system repair can lead to serious injury or damage.
