Here's a general outline. This is NOT a substitute for a proper repair manual specific to your 1992 Pontiac LeMans. A Haynes or Chilton manual is highly recommended and will provide detailed instructions and diagrams specific to your vehicle's year and model. Differences in fuel system design can exist even between seemingly similar models.
Safety First:
* Disconnect the battery negative terminal. This is paramount to prevent accidental sparks.
* Work in a well-ventilated area. Gasoline fumes are extremely hazardous.
* Wear safety glasses and gloves.
* Have a fire extinguisher nearby.
* Use proper jack stands. Never work under a car supported only by a jack.
General Steps (Consult your repair manual for precise details):
1. Prepare the Vehicle:
* Safely raise the vehicle and secure it on jack stands.
* Locate the fuel pump access panel. This is typically under the rear seat or in the trunk (check your repair manual).
2. Release Fuel System Pressure:
* This step is crucial to prevent gasoline spraying. The method varies depending on the vehicle. Your repair manual will explain how to do this safely, possibly involving disconnecting a fuel pressure regulator line. Never attempt this without consulting your manual.
3. Access the Fuel Pump:
* Remove the access panel (this may involve removing the rear seat).
* You'll likely see the fuel pump module, which houses the pump itself and other components (sending unit, etc.).
4. Disconnect Electrical Connections:
* Carefully disconnect the electrical connectors to the fuel pump module. Take photos or make notes to ensure correct reassembly.
5. Disconnect Fuel Lines:
* Use fuel line disconnect tools or pliers to carefully disconnect the fuel lines from the fuel pump module. Have rags ready to absorb any spilled fuel.
6. Remove the Fuel Pump Module:
* This usually involves removing some retaining clips or bolts securing the module to the fuel tank. Again, your repair manual is vital here, as the method can vary considerably.
7. Replace the Fuel Pump:
* Once the module is out, you'll likely need to remove the old pump from the module (often a simple process).
* Install the new fuel pump, ensuring it's properly seated.
8. Reassembly:
* Reassemble the module, ensuring all components are properly seated and secured.
* Reconnect the fuel lines, taking care to avoid kinks or leaks.
* Reconnect the electrical connectors.
* Reinstall the access panel.
9. Lower the Vehicle: Carefully lower the vehicle.
10. Reconnect the Battery: Reconnect the battery negative terminal.
11. Prime the Fuel System (and Check for Leaks): Consult your repair manual for the procedure. You might need to crank the engine several times (without starting) to prime the pump before attempting to start the vehicle. Carefully check for fuel leaks around all connections.
Important Considerations:
* Fuel Pump Replacement Kit: Consider buying a fuel pump replacement kit which often includes new seals and other necessary components.
* Fuel Filter: While not directly related to the fuel pump, it's often wise to replace the fuel filter at the same time to improve fuel system performance.
This is a simplified overview. Again, using a repair manual specific to your 1992 Pontiac LeMans is absolutely crucial for a safe and successful repair. If you are not comfortable performing this repair yourself, it is best to take your vehicle to a qualified mechanic. Improper fuel system repair can be extremely dangerous.
