Here's a general overview. Specific steps may vary slightly depending on the engine (3.4L V6, 3.8L V6, or LT1 V8). Always consult a repair manual specific to your 1996 Impala's engine and trim level for precise instructions and torque specifications. A Haynes or Chilton manual is a good investment.
Safety First:
* Disconnect the negative battery cable before starting any work.
* Work in a well-ventilated area. Fuel vapors are flammable and harmful.
* Use proper safety glasses and gloves.
* Have a fire extinguisher nearby.
* Dispose of old fuel and components properly.
Tools You'll Likely Need:
* Socket set (metric)
* Wrenches (metric)
* Screwdrivers (Phillips and flathead)
* Fuel line disconnect tools (may be needed)
* Fuel pump pliers or a suitable tool for removing the retaining ring (if applicable)
* Jack and jack stands
* Wheel chocks
* Shop rags
* Safety glasses
* Gloves
* Drain pan
* New fuel pump (make sure it's the correct one for your engine)
* Possibly a fuel pressure gauge (to verify pressure after installation)
General Steps (Consult your repair manual for specifics):
1. Prepare the Vehicle: Secure the vehicle on jack stands after properly jacking it up and chocking the wheels. Locate the fuel pump access panel, usually under the rear seat (or in the trunk, depending on model).
2. Drain the Fuel Tank (Partially): This reduces the amount of fuel you'll be working around. You can siphon some fuel out, but be careful.
3. Remove the Fuel Pump Access Panel: This usually involves removing the rear seat bottom cushion and accessing a panel covering the fuel pump.
4. Disconnect Electrical Connections: Carefully disconnect the electrical connectors to the fuel pump. Take photos or make notes to ensure you reconnect them correctly.
5. Disconnect Fuel Lines: Use the appropriate fuel line disconnect tools to carefully separate the fuel lines from the fuel pump. Have rags ready to absorb any spilled fuel.
6. Remove the Fuel Pump Assembly: This is the most challenging step. There's often a retaining ring holding the pump in place. You'll likely need the proper tools to remove this ring. The pump assembly itself might be pulled straight out or held in by bolts. Your repair manual will show you exactly how to remove it.
7. Install the New Fuel Pump: Carefully install the new fuel pump assembly, making sure the O-rings and seals are in place and undamaged. Reinstall the retaining ring (if applicable).
8. Reconnect Fuel Lines and Electrical Connections: Carefully reconnect the fuel lines and electrical connectors, making sure everything is securely attached.
9. Reinstall the Fuel Pump Access Panel and Rear Seat: Put everything back together, ensuring you haven't forgotten anything.
10. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
11. Check for Leaks: Inspect for any fuel leaks. Do not start the engine yet if you see any leaks.
12. Start the Engine and Test: Once you're certain there are no leaks, start the engine and check for proper operation. Listen for unusual noises from the fuel pump and make sure the vehicle runs normally. A fuel pressure gauge can help confirm proper fuel delivery.
Crucial Considerations:
* Fuel Pump Strainer: Replace the fuel pump strainer (sock) while you're at it. It's a cheap part and often clogged, contributing to fuel pump failure.
* Fuel Pressure Regulator: Consider testing or replacing the fuel pressure regulator if you suspect a problem beyond just the pump.
* Repair Manual: Absolutely crucial for detailed instructions specific to your vehicle. Don't attempt this without one.
This is a complex process. If you're uncomfortable with any step, consult a professional. Remember safety is paramount when working with fuel systems.
