Here's a general outline of the process. This is a *general guide* and specifics might vary slightly depending on your engine type (4.0L SOHC, 4.0L OHV, or 5.0L V8). Always consult a repair manual specific to your vehicle's year, engine, and trim level for detailed instructions and diagrams.
Safety First!
* Disconnect the battery's negative terminal. This is crucial to prevent sparks that could ignite fuel vapors.
* Work in a well-ventilated area. Fuel vapors are highly flammable.
* Wear safety glasses and gloves.
* Have a fire extinguisher readily available.
* Use proper fuel-safe containers to collect any spilled fuel.
Steps (general):
1. Prepare the vehicle:
* Park on a level surface.
* Secure the vehicle using parking brake and wheel chocks.
2. Access the fuel pump: This typically involves:
* Lowering the fuel tank: This is often the most challenging part. You'll likely need to disconnect the fuel lines, electrical connector, and tank straps. Some Explorers require dropping the tank from underneath, while others may allow for access through the trunk or rear passenger compartment. Your repair manual will detail this.
* Accessing the fuel pump assembly from the top: Some models allow access through a panel in the trunk or rear cargo area.
3. Disconnect the fuel lines:
* WARNING: Fuel will likely be under pressure in the lines. You'll need to relieve the pressure before disconnecting the lines. This is often done by starting the car and letting it run until it stalls (after disconnecting the fuel pump relay). Consult your repair manual for the proper procedure to relieve pressure safely. Never use a lighter or open flame near fuel.
* Carefully disconnect the fuel lines using the proper tools. Have rags ready to absorb any spilled fuel. Mark the lines to ensure proper reconnection.
4. Disconnect the electrical connector: Unplug the fuel pump electrical connector.
5. Remove the fuel pump assembly: This usually involves removing a retaining ring or cover to access the pump assembly. The pump itself is usually held in place by a retaining clip or bolts.
6. Remove the old fuel pump: Carefully remove the old fuel pump from the assembly. Pay attention to the location of the fuel level sender and other components within the assembly.
7. Install the new fuel pump: Install the new fuel pump into the assembly, ensuring it's seated correctly. Reinstall any components (such as the fuel level sender).
8. Reinstall the fuel pump assembly: Carefully reinstall the fuel pump assembly. Make sure the retaining ring or bolts are tightened correctly.
9. Reconnect the electrical connector and fuel lines: Reconnect the electrical connector and fuel lines, ensuring everything is securely fastened and properly sealed. Double-check all connections.
10. Raise the fuel tank (if necessary): Carefully raise and secure the fuel tank back into its original position. Reconnect the straps.
11. Reconnect the battery: Reconnect the negative battery terminal.
12. Start the vehicle: Start the vehicle and check for leaks. Listen for any unusual noises from the fuel pump.
Important Considerations:
* Repair Manual: This is absolutely essential. The steps above are highly generalized. A repair manual specific to your 1998 Ford Explorer will provide detailed instructions, diagrams, torque specifications, and crucial safety information.
* Fuel Pump Replacement Kit: Consider purchasing a complete fuel pump replacement kit, which often includes a new fuel filter, gaskets, and other necessary parts.
* Fuel Pressure Test: After installation, a fuel pressure test can verify proper fuel pump operation.
This is a complex repair with potential safety hazards. If you are unsure about any step, consult a professional mechanic. Improper repair can result in vehicle damage or injury.
