Safety Precautions:
* Disconnect the negative battery cable. This is paramount for safety.
* Work in a well-ventilated area. Fuel fumes are dangerous.
* Use appropriate safety glasses and gloves.
* Have a fire extinguisher nearby.
* Be aware of potential fuel leaks. Use absorbent materials to catch any spills.
Tools and Materials:
* New fuel pump assembly: Make sure you get the correct part number for your Avalanche.
* Socket set (metric): Various sizes will be needed.
* Wrench set (metric): Again, a variety of sizes.
* Screwdrivers (Phillips and flathead):
* Fuel pump pliers or fuel line disconnect tool: These make disconnecting fuel lines much easier and safer.
* Jack and jack stands: Essential for safe working conditions.
* Drain pan: To catch any spilled fuel.
* Fuel line clamps: May be needed depending on your fuel line type.
* Shop rags or absorbent towels:
* Torque wrench: To ensure proper tightening of bolts and connections.
* Safety glasses and gloves:
* Fuel pressure gauge (optional but recommended): To check fuel system pressure after installation.
Steps (General Outline - Consult your repair manual for specifics):
1. Prepare the Vehicle: Park on a level surface, engage the parking brake, and disconnect the negative battery cable.
2. Access the Fuel Pump: This typically involves lowering the fuel tank. This often requires removing the rear seats, accessing panels underneath the vehicle, and potentially disconnecting various components. Your repair manual will give precise instructions on this step.
3. Drain the Fuel Tank (partially): This reduces the weight and amount of fuel you'll be working around. Use a siphon pump or drain plug if your tank has one.
4. Disconnect the Fuel Lines: Use the appropriate fuel line disconnect tool to carefully separate the fuel lines from the fuel pump assembly. Have absorbent materials ready to catch any spilled fuel. Note: Fuel pressure may still exist even with the battery disconnected. Release any remaining pressure according to your repair manual's instructions.
5. Disconnect Electrical Connectors: Disconnect the electrical connector from the fuel pump.
6. Remove the Fuel Pump Assembly: This typically involves removing a retaining ring or bolts holding the fuel pump assembly in the tank.
7. Install the New Fuel Pump Assembly: Carefully install the new fuel pump assembly, making sure it seats properly and the electrical connector is securely attached.
8. Reconnect the Fuel Lines: Carefully reconnect the fuel lines using the fuel line disconnect tool. Double-check for leaks.
9. Raise the Fuel Tank: Carefully raise the fuel tank back into its position, securing it as per your repair manual.
10. Reconnect Electrical Connectors and Other Components: Make sure everything is securely connected.
11. Reconnect the Battery Cable: Reconnect the negative battery cable.
12. Check for Leaks: Inspect all fuel connections for leaks.
13. Start the Engine: Start the engine and listen for any unusual noises. Check for any fuel leaks.
14. Test Drive: Take a short test drive to ensure the fuel pump is functioning correctly.
Important Considerations:
* Fuel System Pressure: Some fuel pumps require priming before starting the vehicle. Check your manual for details.
* Fuel Pump Relay: A faulty fuel pump relay can mimic a bad fuel pump. Testing the relay is a good troubleshooting step before replacing the pump.
* Fuel Filter: Consider replacing the fuel filter while you're working on the fuel system.
Disclaimer: This information is for general guidance only. Improperly performing this repair can lead to serious injury or damage. Consult your vehicle's repair manual and if you are uncomfortable performing this repair, seek the assistance of a qualified mechanic.
