How do you depressurize the fuel system on a 2002 Pontiac Grand Am?

There's no single "depressurize" procedure for a 2002 Pontiac Grand Am fuel system like you might find with some older cars that have a manual fuel pump shutoff. The fuel system is designed to maintain pressure to ensure proper engine operation. Instead of "depressurizing," you're usually dealing with relieving pressure before working on components. This is typically done indirectly.

The safest and most effective way to relieve fuel pressure before working on the fuel system of a 2002 Pontiac Grand Am is to:

1. Disconnect the negative (-) battery terminal. This will disable the fuel pump, preventing it from running. This is the *most important* step for safety.

2. Start the engine and let it run until it stalls. The fuel pump will run until the fuel pressure drops low enough that the engine stalls from fuel starvation. This method safely vents the system.

Important Considerations and Warnings:

* Safety First: Gasoline is highly flammable. Do not work near open flames or sparks. Work in a well-ventilated area. Eye protection is also recommended.

* Professional Help: If you're uncomfortable performing these steps, or if you are not mechanically inclined, it's best to take your Grand Am to a qualified mechanic. Improperly working on a fuel system can be dangerous.

* Alternative Methods (Not Recommended): Some sources might suggest using a fuel pressure gauge and relieving pressure manually through the gauge itself. This is generally NOT recommended for non-professionals as it can be dangerous and requires specialized tools. The engine stalling method is far safer and simpler.

After the engine stalls due to fuel pressure dropping, you can safely proceed with your fuel system work. Remember to reconnect the negative battery terminal after completing your repairs.