1. Safety First:
* Disconnect the battery's negative terminal. This is crucial to prevent sparks that could ignite fuel vapors.
* Ventilate the area. Work in a well-ventilated area or outside. Fuel vapors are heavier than air and can accumulate in low-lying spaces.
* Wear safety glasses and gloves.
2. Accessing the Fuel Pump:
* Locate the fuel pump access panel. This is typically located under the rear seat or in the trunk, often requiring the removal of interior panels or carpeting. Your repair manual will show the precise location.
* Once located, remove the access panel. You may need tools like screwdrivers or panel removal tools.
3. Disconnecting the Fuel System:
* Relieve fuel pressure. This is crucial to prevent fuel spraying. The method varies; some cars have a Schrader valve (similar to a tire valve) on the fuel rail that can be used to release pressure. Your repair manual will show how to do this safely for your car. If unsure, consult a professional.
* Disconnect the fuel lines. Use fuel-resistant tubing to cap the open ends of the fuel lines to prevent fuel spillage and evaporation.
* Disconnect the electrical connector. This is the connector to the fuel pump's electrical motor.
* Disconnect the fuel pump retaining ring or bolts. The pump is secured to the tank, usually with a retaining ring that needs to be loosened or bolts to be removed.
4. Removing the Fuel Pump:
* Carefully remove the fuel pump assembly. This assembly typically includes the pump, sending unit (fuel level sensor), and other components. It may be necessary to use a specialized fuel pump removal tool to aid in extraction.
5. Installation (Reverse Order):
Installation is the reverse of the removal process. Ensure all connections are secure and the retaining ring or bolts are tightened properly. Make sure to carefully check for leaks after re-installation. It is highly recommended that after installation, have a mechanic use a fuel pressure gauge to check the fuel system is working properly and there are no leaks.
Important Considerations:
* Repair Manual: A repair manual specific to your 1990 Pontiac Bonneville is highly recommended. This will provide detailed instructions, diagrams, and torque specifications.
* Fuel Pump Replacement: If replacing the fuel pump, ensure you get a pump that is the correct specification for your vehicle.
* Professional Help: If you are uncomfortable performing this repair, it's best to take your vehicle to a qualified mechanic. Working with fuel systems can be dangerous if not handled properly.
This is a general guide. Always refer to your vehicle's repair manual for specific instructions and safety precautions. Improper handling of fuel systems can be extremely dangerous. If in doubt, seek professional help.
