Here's a general outline. Specific steps may vary slightly depending on your car's exact configuration:
1. Preparation:
* Gather your tools: You'll need a socket set (various sizes), wrenches, screwdrivers (Phillips and flathead), fuel pump pliers (optional but highly recommended), a fuel line disconnect tool, safety glasses, gloves, jack stands, jack, and a new fuel pump (ensure it's the correct one for your 5.0L engine). A shop manual specific to your vehicle year and model is highly recommended.
* Drain the fuel tank: This isn't strictly necessary but significantly reduces the risk of fuel spillage. You can siphon the fuel out or carefully lower the fuel level.
* Disconnect the negative battery terminal.
* Raise and secure the car: Use jack stands to safely support the vehicle after lifting it with a jack. Never work under a car supported only by a jack.
2. Accessing the Fuel Pump:
* Locate the fuel pump access panel: This is usually located in the trunk, under the rear seat, or under the carpet in the trunk area. Consult your repair manual to locate the exact position.
* Remove the access panel: This often involves removing screws or bolts.
3. Removing the Old Fuel Pump:
* Disconnect the fuel lines: Use the fuel line disconnect tool to carefully separate the fuel lines from the fuel pump. Have rags ready to absorb any spilled fuel. Be absolutely sure to mark which line goes where to prevent installation errors.
* Disconnect the electrical connector: Unplug the electrical connector from the fuel pump.
* Remove the fuel pump retaining ring: This usually involves using a special fuel pump pliers to turn and release the ring. Be careful not to damage the tank.
* Remove the fuel pump assembly: Carefully lift the fuel pump assembly out of the tank. It may be attached to a sending unit that measures fuel level.
4. Installing the New Fuel Pump:
* Inspect the new fuel pump: Ensure it's the correct part number and undamaged.
* Install the new fuel pump: Carefully lower the new fuel pump assembly into the tank, ensuring it seats correctly.
* Replace the retaining ring: Secure the retaining ring firmly using fuel pump pliers.
* Reconnect the electrical connector: Plug the connector back onto the fuel pump.
* Reconnect the fuel lines: Connect the fuel lines, ensuring a secure connection. Double-check your markings to ensure correct connection.
* Replace the access panel: Secure the access panel using the removed screws or bolts.
5. Final Steps:
* Lower the car: Carefully lower the car from the jack stands.
* Reconnect the negative battery terminal.
* Check for leaks: Carefully inspect the fuel lines for leaks.
* Prime the fuel system: Depending on your vehicle, you may need to prime the fuel system by turning the ignition key on and off several times (but not starting the engine) to build pressure in the fuel lines. Check your repair manual for specific instructions.
* Start the engine: After the fuel system has been primed, start the engine and check for proper operation. Listen for unusual noises from the fuel pump. Check for fuel leaks.
Important Considerations:
* Fuel pressure: You might want to check fuel pressure after the installation to ensure the new pump is delivering the correct pressure. A fuel pressure gauge is necessary for this.
* Repair manual: A repair manual specific to your 1987 Ford Mustang 5.0 LX is highly recommended. It will provide detailed diagrams and instructions.
* Safety: Fuel is dangerous. Take all necessary precautions to avoid fire or injury.
This is a complex process, and this guide provides a general overview. If you are not comfortable performing this repair, take your vehicle to a qualified mechanic. Improper installation can lead to serious damage or injury.
