Here's a step-by-step guide:
1. Safety First!
* Disconnect the negative battery terminal: This is crucial to prevent accidental sparking near flammable fuel.
* Work in a well-ventilated area: Fuel fumes are dangerous.
* Wear safety glasses: To protect your eyes from potential splashes.
* Have a fire extinguisher nearby: Just in case.
2. Locate the Fuel Pump Relay (or Fuel Pump Inertia Switch):
* The location of the relay or switch varies slightly depending on the exact trim level. Consult your owner's manual or a repair manual specific to your 1997 Cavalier. Common locations are in the under-hood fuse box or the passenger compartment fuse box. The inertia switch might be under the dash or in the engine compartment.
* The inertia switch is a resettable safety device. If you've been in an accident, it may be tripped and need to be reset before attempting to relieve pressure. Look for a small, usually red, button that you push to reset it.
3. Disconnect the Fuel Pump Relay (Preferred Method):
* Once you've located the fuel pump relay, carefully remove it from its socket. This interrupts the power to the fuel pump.
4. Crank the Engine (With Relay Removed):
* Have someone crank the engine for approximately 10-15 seconds. This will allow the fuel pressure to bleed off. The engine won't start because the fuel pump is disabled.
5. Reconnect the Fuel Pump Relay (or reset the inertia switch):
* After cranking, carefully reinstall the fuel pump relay or reset the inertia switch.
Important Considerations:
* If you're unsure about any step, consult a qualified mechanic. Improperly handling fuel systems can be dangerous.
* This procedure only relieves pressure in the fuel lines. There may still be fuel in the fuel tank and injectors.
* This method is generally used before working on fuel lines or components. Relieving pressure reduces the risk of fuel spraying or spilling during repairs.
* Some mechanics may use a fuel pressure gauge to verify that the pressure has been relieved.
Alternative (Less Recommended):
Some suggest disconnecting the fuel line at the fuel rail, but this is generally not recommended for the average DIY mechanic because it increases the risk of fuel spraying and presents a higher safety hazard. It's far safer to disable the pump electrically as described above.
Remember, safety is paramount when working with automotive fuel systems. If you're not comfortable performing this procedure, it's always best to seek professional help from a qualified mechanic.
