Here's a general outline of the process. This is not a comprehensive guide, and you should consult a repair manual specific to your 2004 Impala for detailed instructions and diagrams. Improperly following these steps could lead to damage or injury.
1. Safety First:
* Disconnect the negative battery terminal. This is crucial to prevent electrical shorts and 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. Prepare the Vehicle:
* Lower the fuel level. Driving the car until nearly empty significantly reduces the amount of fuel you'll need to deal with.
* Jack up the car and secure it on jack stands. Never work under a car supported only by a jack.
3. Access the Fuel Pump:
* Locate the fuel pump access panel. This is usually under the rear seat or in the trunk (check your repair manual for the exact location). You might need to remove the rear seat or some interior trim.
* Remove the access panel.
4. Disconnect the Fuel System:
* Disconnect the electrical connector to the fuel pump.
* Disconnect the fuel lines. You'll likely need fuel line disconnect tools to avoid damaging the lines. Be prepared for some fuel spillage; have rags handy. Clamp the fuel lines to prevent further leakage.
* Release the retaining ring or bolts holding the fuel pump assembly in place (refer to your repair manual for specifics).
5. Remove the Fuel Pump Assembly:
* Carefully remove the fuel pump assembly. It may be held in place by a retaining ring, clips, or bolts. This is usually a multi-part assembly and the pump itself may be part of a larger module.
6. Replace the Fuel Pump:
* Compare the new fuel pump to the old one to ensure they are identical.
* Install the new fuel pump assembly, reversing the removal process. Make sure all seals and o-rings are properly seated.
7. Reassemble Everything:
* Reconnect the fuel lines, ensuring they are securely attached and clamped.
* Reconnect the electrical connector.
* Replace the access panel.
* Lower the car.
8. Prime the Fuel System (Important):
* Before starting the car, you'll likely need to prime the fuel system. This involves turning the ignition key to the "on" position several times (without cranking the engine) to allow the fuel pump to fill the lines. Refer to your repair manual for specifics on priming.
9. Test the Vehicle:
* Reconnect the battery.
* Start the vehicle and check for leaks. Listen for any unusual noises from the fuel pump. Check for proper fuel pressure if you have a gauge.
Crucial Considerations:
* Repair Manual: A repair manual specific to your 2004 Chevrolet Impala is absolutely essential. It will provide detailed diagrams, torque specifications, and step-by-step instructions.
* Fuel Pressure: If you're mechanically inclined, checking fuel pressure before and after the replacement is recommended.
* Professional Help: If you're not comfortable with this level of automotive repair, it's best to take your Impala to a qualified mechanic. Working with fuel systems can be dangerous if not done correctly.
This information is for guidance only. Always consult a repair manual and exercise extreme caution when working with fuel systems. Incorrect procedures could result in injury or damage.
