Here's a general outline. This is not a complete, step-by-step guide, and specifics may vary slightly depending on your car's configuration. Consult a repair manual specific to your 1990 Buick Regal Custom for detailed instructions, diagrams, and torque specifications. A Haynes or Chilton manual is a good investment for this type of work.
1. Preparation:
* Safety First: Disconnect the negative battery cable. Work in a well-ventilated area. Have fire extinguisher nearby.
* Gather Tools: You'll need various tools including sockets, wrenches (metric), screwdrivers (Phillips and flathead), a fuel line disconnect tool, a fuel pump pliers (optional but helpful), jack stands, jack, and possibly a fuel pressure gauge (to check pressure after installation).
* Gather Parts: New fuel pump, fuel filter (it's a good idea to replace this while you're at it), fuel pump gasket (if necessary), and any other necessary seals or clips.
2. Accessing the Fuel Pump:
* Locate the Fuel Pump: On many 1990 Buick Regals, the fuel pump is located inside the fuel tank. This requires dropping the fuel tank. Your repair manual will show the exact location and procedure for your model.
* Drain the Fuel Tank: This is crucial for safety and ease of work. Siphon the fuel out carefully into an approved container. Never work near an open flame.
* Disconnect the Fuel Lines: Carefully disconnect the fuel lines from the fuel pump. Use a fuel line disconnect tool to avoid damage. Have rags ready to soak up any spilled fuel. Be mindful of fuel pressure. It's usually best to relieve any pressure before disconnecting lines. Your repair manual will detail this procedure.
* Disconnect the Electrical Connector: Unplug the electrical connector from the fuel pump.
* Lower the Fuel Tank: This typically involves unbolting the tank straps and carefully lowering the tank. You might need to disconnect the fuel tank sending unit and other components attached to the tank. Support the tank with jack stands to avoid damage.
3. Replacing the Fuel Pump:
* Remove the Old Fuel Pump: Access the fuel pump assembly within the tank. The pump may be accessed from the top or bottom depending on your model. It's usually held in place by a retaining ring or clamp. Carefully remove the old pump.
* Install the New Fuel Pump: Install the new fuel pump, ensuring a proper seal using the new gasket if needed. Follow the manufacturer's instructions for installation.
* Reassemble Everything: Carefully reinstall the fuel pump assembly in the tank, reconnect the fuel lines (ensure correct connections!), electrical connector, and other components.
* Raise the Fuel Tank: Carefully raise the fuel tank and secure it back into its original position. Tighten all bolts and straps to the manufacturer's specifications.
4. Testing:
* Reconnect the Battery: Reconnect the negative battery cable.
* Check for Leaks: Carefully inspect all fuel lines and connections for leaks.
* Start the Engine: Start the car and let it run for a few minutes to ensure the new pump is working correctly. Listen for any unusual noises.
* Check Fuel Pressure: If you have a fuel pressure gauge, check the fuel pressure to ensure it's within the manufacturer's specifications.
Disclaimer: This is a simplified overview. Incorrectly performing this repair could result in serious injury or damage to your vehicle. Always refer to a repair manual specific to your 1990 Buick Regal Custom for detailed instructions and safety precautions. If you are uncomfortable performing this repair yourself, take your vehicle to a qualified mechanic.
