1. Safety First:
* Disconnect the battery: This prevents accidental sparking.
* Relieve fuel pressure: Consult your repair manual for the specific procedure. This usually involves running the engine until it stalls after disconnecting the fuel pump relay. There might be a schrader valve on the fuel rail to release pressure manually.
* Work in a well-ventilated area: Fuel fumes are flammable and toxic.
* Wear safety glasses and gloves: Protect yourself from fuel spills and sharp parts.
2. Preparation:
* Gather tools: You'll need sockets, wrenches (including a fuel line disconnect tool), screwdrivers, pliers, jack stands, a fuel pump removal tool (often needed), possibly a fuel pressure gauge, and a new fuel filter. A shop manual is crucial.
* Locate the fuel pump: On most 1989 Trans Ams, it's located inside the fuel tank. This requires dropping the tank.
* Obtain the correct fuel pump: Ensure you buy the exact replacement for your model.
3. Dropping the Fuel Tank:
* Consult your repair manual for the specific procedure. This generally involves:
* Disconnecting the fuel lines (carefully!). Use a fuel line disconnect tool to avoid damage. Have a container ready to catch any spilled fuel.
* Disconnecting the electrical connector to the fuel pump.
* Removing the fuel tank straps and carefully lowering the tank. You'll likely need jack stands to support the vehicle safely.
* Be extremely careful not to damage the fuel lines or electrical wiring.
4. Fuel Pump Replacement:
* Access the fuel pump: This will involve removing the access plate from the top of the fuel tank.
* Remove the old fuel pump: This often requires a specialized fuel pump removal tool to prevent damage to the pump.
* Install the new fuel pump: Ensure the new pump is correctly seated and the gasket is properly placed. Refer to your repair manual for correct orientation.
* Reconnect the electrical connector: Ensure a secure connection.
5. Reassembly:
* Reinstall the access plate.
* Carefully raise the fuel tank and secure it with the straps.
* Reconnect the fuel lines: Double-check all connections for leaks.
* Reconnect the battery.
6. Testing:
* Check for leaks: Carefully inspect all fuel lines and connections for leaks.
* Start the engine: Listen for any unusual noises from the fuel pump.
* Check fuel pressure (if possible): Use a fuel pressure gauge to ensure proper pressure.
Important Considerations:
* Fuel tank venting: Ensure the fuel tank vent system is functioning properly.
* Fuel filter replacement: It's recommended to replace the fuel filter while you have the tank dropped.
This is a simplified overview. You absolutely must consult a repair manual for your specific 1989 Pontiac Trans Am before attempting this repair. If you are not comfortable with this type of work, take it to a qualified mechanic. Improper installation can lead to fuel leaks, fire, or damage to your vehicle.
