Here's a general outline; specific steps may vary slightly depending on the exact engine configuration. This is NOT a substitute for a detailed repair manual specific to your vehicle. Consult a repair manual for detailed diagrams, torque specifications, and other crucial information.
1. Preparation:
* Safety First: Disconnect the negative battery terminal. Allow the fuel system to depressurize. This might involve starting the engine and letting it run until it stalls (after disconnecting the fuel pump relay, if accessible). Then, wait several minutes to ensure pressure is relieved.
* Gather Tools: You'll need jack stands, jack, socket wrench set (metric), various size wrenches, screwdrivers (Phillips and flathead), fuel line disconnect tool, safety glasses, gloves, rags, new fuel pump, and possibly a fuel pump strainer. A fuel pump pressure gauge can also be helpful.
* Locate the Fuel Pump: The fuel pump is typically located inside the fuel tank, under the vehicle. You may need to remove the rear seat or access panel in the vehicle's floor to reach it. Your repair manual will show the exact location.
2. Accessing the Fuel Pump:
* Drop the Fuel Tank: This is usually the most involved part. You'll likely need to support the tank with jack stands, disconnect the fuel lines, electrical connectors, and the tank straps. Some models require lowering the fuel tank substantially or even completely removing it. Be extremely careful handling the tank to prevent damage and spillage. The tank may be heavy and contain residual fuel.
* Alternative Access (if applicable): Some models may have an access panel under the vehicle that allows access to the fuel pump without dropping the entire tank. Check your repair manual.
3. Fuel Pump Replacement:
* Disconnect Fuel Lines: Use the fuel line disconnect tool to carefully disconnect the fuel lines from the pump. Have rags ready to absorb any fuel spillage.
* Disconnect Electrical Connector: Unplug the electrical connector from the fuel pump.
* Remove the Fuel Pump: This usually involves removing the retaining ring or bolts holding the pump assembly in place.
* Install New Fuel Pump: Install the new fuel pump, ensuring it's properly seated and oriented.
* Reconnect Everything: Reconnect the electrical connector, fuel lines, and tank straps. Double-check all connections.
4. Reassembly:
* Raise the Fuel Tank: Carefully raise the fuel tank back into its position.
* Reconnect Everything: Double-check all connections before lowering the vehicle.
* Recheck Connections: Make sure all fuel lines and electrical connections are secure.
* Reconnect the Battery: Reconnect the negative battery terminal.
5. Post-Installation:
* Check for Leaks: Inspect all fuel lines and connections for leaks.
* Start the Engine: Start the engine and let it run for a few minutes to ensure the new pump is working correctly. Check for any unusual noises.
* Pressure Test (optional): If you have a fuel pressure gauge, test the fuel system pressure to verify it's within the manufacturer's specifications.
Disclaimer: This is a general overview. Improperly performing this repair can result in serious injury or damage to your vehicle. Always consult a detailed repair manual specific to your 1994 Oldsmobile Silhouette before attempting this repair. If you are not comfortable performing this repair yourself, it's recommended to take your vehicle to a qualified mechanic. Working with gasoline is dangerous; be cautious and prioritize safety.
