Here's a general outline of the steps involved. Remember this is a *general guide* and specifics may vary slightly. Always prioritize safety and consult your repair manual.
1. Preparation:
* Safety First: Disconnect the negative battery terminal. Allow the fuel system to depressurize. This usually involves running the engine until it stalls after a few ignition cycles (or use a fuel pressure release tool).
* Gather Tools: You'll need jack stands, a jack, socket wrench set (metric), screwdrivers (Phillips and flathead), fuel pump pliers (or a similar tool to disconnect fuel lines), a new fuel pump and filter (ensure they match your vehicle's specifications!), rags, safety glasses, and possibly a fuel line disconnect tool.
* Locate the Fuel Pump: It's typically located inside the fuel tank, accessed from under the vehicle. You might need to remove the rear seat cushion(s) to reach the access panel.
2. Accessing the Fuel Pump:
* Lower the Vehicle: Safely jack up the rear of the vehicle and secure it with jack stands.
* Remove Access Panel: This usually involves removing some bolts or clips covering the fuel pump access. Your repair manual will have detailed instructions for your model.
* Disconnect Electrical Connections: Carefully disconnect the fuel pump's electrical connector. Note the position and order for easier reassembly. Take pictures if it helps.
* Disconnect Fuel Lines: Use the fuel pump pliers or a fuel line disconnect tool to carefully disconnect the fuel lines. Have rags ready to absorb any spilled fuel. Be mindful of fuel fumes. Work in a well-ventilated area.
3. Removing and Replacing the Fuel Pump:
* Remove the Fuel Pump Assembly: This often involves unbolting the fuel pump assembly from the tank. The assembly usually has a retaining ring and/or bolts to remove.
* Replace Fuel Filter (if applicable): If the fuel filter is part of the assembly, replace it.
* Install the New Fuel Pump Assembly: Carefully install the new fuel pump assembly, ensuring it's seated correctly.
* Reconnect Fuel Lines and Electrical Connections: Reattach the fuel lines and electrical connectors, ensuring they are secure.
4. Reassembly:
* Secure the Access Panel: Replace the access panel and secure it.
* Raise the Vehicle: Carefully lower the vehicle.
* Reconnect the Battery: Reconnect the negative battery terminal.
5. Priming the Fuel System (Important):
* After reassembly, you will likely need to prime the fuel system. Your car's fuel system may have a priming process built-in, or it may require several attempts at starting the car to allow the fuel pump to fill the lines. Consult your repair manual for the specific priming procedure for your 1999 Pontiac Grand Prix.
Important Considerations:
* Fuel Pressure: Ensure the fuel system is depressurized before disconnecting any fuel lines.
* Fuel Spills: Minimize fuel spills to avoid fire hazards.
* Repair Manual: A repair manual specific to your 1999 Pontiac Grand Prix is indispensable. It provides detailed instructions, diagrams, and torque specifications to ensure a safe and successful repair.
This is a simplified overview. Incorrect procedures can lead to serious injury or damage to your vehicle. If you're not comfortable performing this repair, it's strongly recommended that you take your vehicle to a qualified mechanic. The cost of a professional repair might be less than the cost of a mistake.
