Here's a general outline of the process. Consult a repair manual specific to your 1972 Buick Riviera for detailed instructions and diagrams. The specifics might vary slightly depending on the exact configuration of your fuel tank.
1. Safety First:
* Disconnect the battery's negative terminal. This prevents accidental sparks.
* Work in a well-ventilated area. Gasoline fumes are highly flammable and dangerous.
* Wear safety glasses and gloves.
* Have a fire extinguisher nearby.
2. Preparation:
* Drain the fuel tank. This is crucial. You can use a fuel pump or siphon to remove as much fuel as possible. Dispose of the fuel properly.
* Gather your tools: Socket wrench set (metric and possibly standard), screwdrivers (Phillips and flathead), possibly a fuel line disconnect tool, wire strippers/crimpers, new fuel sending unit, rags, and safety glasses/gloves.
* Locate the fuel tank access. This is usually under the car, possibly requiring removal of the spare tire or other components. Consult your repair manual.
3. Accessing the Fuel Sending Unit:
* Securely support the fuel tank. This might involve jacking up the car and using jack stands. Never work under a car supported only by a jack.
* Remove the fuel tank access panel or access the tank from the underside. This often involves removing bolts or clamps holding the tank straps.
* Disconnect the fuel lines. This is critical and requires care. You might need a fuel line disconnect tool to prevent leaks and damage to the lines. Be prepared for some fuel spillage, even with the tank mostly drained. Use rags to soak up any spills.
* Disconnect the electrical connector from the fuel sending unit.
* Remove the fuel sending unit. This is usually held in place by a retaining ring or bolts. It may be necessary to carefully manipulate the unit to remove it.
4. Installation:
* Inspect the fuel tank for rust or damage. Address any issues found now.
* Install the new fuel sending unit. Ensure it's correctly seated and secured.
* Reconnect the electrical connector.
* Reconnect the fuel lines. Double-check for leaks.
* Reinstall the fuel tank access panel or secure the fuel tank back into place.
5. Final Checks:
* Reconnect the battery's negative terminal.
* Check for fuel leaks. Thoroughly inspect all connections.
* Fill the fuel tank (slowly, to avoid overfilling).
* Test the fuel gauge to ensure it's working correctly.
Important Considerations:
* Repair manuals are invaluable. They provide specific instructions and torque specifications for your vehicle.
* Take photos as you disassemble. This will help with reassembly.
* Replacing the fuel filter is a good idea while you're working in this area.
* Improper installation can lead to fuel leaks and fire hazards. If you're not comfortable performing this repair, consult a qualified mechanic.
This is a general guide; consult your specific repair manual for your 1972 Buick Riviera to ensure safe and successful completion of this repair. Failing to follow proper procedures can result in serious injury or damage.
