Here's a general outline. This is NOT a complete guide and should not be considered a substitute for a professional repair manual specific to your vehicle. Improper procedures can lead to damage or injury.
1. Preparation:
* Consult a Repair Manual: Obtain a repair manual specific to your 2003 Lincoln LS. This will provide detailed instructions, diagrams, torque specifications, and other crucial information. Haynes and Chilton manuals are readily available.
* Gather Tools: You'll need a variety of tools, including but not limited to: sockets (various sizes), wrenches, screwdrivers (Phillips and flathead), fuel line disconnect tools, a fuel pump pliers or special tool for the retaining ring (if applicable), jack stands, jack, safety glasses, gloves, rags, and a torque wrench.
* Safety Precautions: Work in a well-ventilated area. Have a fire extinguisher readily available. Wear safety glasses and gloves. Properly dispose of old fuel and parts.
2. Accessing the Fuel Pump:
* Lower the Fuel Tank: This is typically the most challenging part. You'll likely need to lower the fuel tank to access the fuel pump. This involves disconnecting the fuel lines, electrical connectors, and possibly the tank straps. Consult your repair manual for the specifics of this process. It often involves supporting the tank with jack stands for safety. Be extremely careful not to damage the fuel tank.
* Locate the Fuel Pump: Once the tank is lowered (or partially lowered depending on the design), you should be able to access the fuel pump access panel on the top of the tank. This panel may require removal.
3. Fuel Pump Replacement:
* Disconnect Electrical Connectors: Carefully disconnect the electrical connectors from the fuel pump. Take pictures or make notes of their locations for reassembly.
* Disconnect Fuel Lines: Use fuel line disconnect tools to carefully disconnect the fuel lines. Have rags ready to absorb any spilled fuel. Again, be very careful; this is where a fire hazard is greatest.
* Remove the Fuel Pump: Depending on your vehicle, the fuel pump may be held in place by a retaining ring, a clamp, or other fastening mechanism. Use the appropriate tools to remove the pump assembly.
* Install the New Fuel Pump: Carefully install the new fuel pump, ensuring it's properly seated and all connections are secure.
* Reconnect Fuel Lines and Electrical Connectors: Reconnect the fuel lines and electrical connectors, making sure they are snug and secure. Consult your repair manual to ensure proper connections.
4. Reassembly:
* Raise the Fuel Tank: Carefully raise the fuel tank back into its original position. Secure the straps.
* Reconnect everything: Ensure all the fuel lines, electrical connections, and other components are properly reconnected.
* Check for Leaks: After reassembly, carefully check for any fuel leaks around the fuel lines and pump assembly.
* Prime the Fuel System (Possibly): Your repair manual will indicate if the fuel system needs priming. This usually involves turning the ignition key on and off several times without starting the engine to build pressure in the system.
5. Test and Drive:
* Reconnect the Negative Battery Terminal: Once everything is checked, reconnect the negative battery terminal.
* Start the Engine: Start the engine and listen for any unusual noises.
* Check for Leaks: Inspect the area for any leaks.
* Test Drive: Take the vehicle for a test drive to ensure the fuel pump is working correctly.
Disclaimer: This is a simplified overview. Incorrect procedures can lead to serious damage or injury. Always consult a professional repair manual specific to your 2003 Lincoln LS before attempting this repair. If you're not comfortable with this level of automotive repair, it's best to take your vehicle to a qualified mechanic. This job involves working with flammable fuel and could be dangerous if not handled correctly.
