Here's a general outline. This is NOT a complete guide, and variations exist depending on your specific Sierra's configuration (2WD vs 4WD, bed length, etc.). Always consult a repair manual specific to your vehicle's year, make, and model before beginning.
Crucial Safety Precautions:
* Disconnect the negative battery terminal before starting any work.
* Ventilate the area well. Fuel vapors are highly flammable.
* Wear safety glasses and gloves.
* Obtain a fuel pump replacement kit that includes new gaskets and o-rings.
* Have a suitable container to catch any remaining fuel in the tank. Consider a siphon pump to remove as much fuel as possible before disconnecting the tank.
General Steps (Consult your repair manual for specifics):
1. Prepare the vehicle: Raise and securely support the truck on jack stands. Never work under a vehicle supported only by a jack.
2. Access: You'll likely need to remove or loosen various components to access the fuel tank, including:
* Bed components: Depending on your truck bed configuration (short, long, etc.), you may need to remove the rear bumper or parts of the bed's under-body panels and possibly even lower parts of the truck bed itself.
* Exhaust System: Parts of the exhaust may need to be temporarily disconnected or moved out of the way.
* Fuel lines: You'll need to disconnect the fuel lines. Note: These lines are under pressure; you might need special tools to release this pressure safely, such as a fuel pressure release tool.
* Electrical connectors: Disconnect the fuel pump electrical connector and any other related sensors or components.
3. Fuel tank straps/supports: Locate the straps or supports holding the fuel tank in place. There are usually several. Carefully release and remove these, supporting the tank as you go. The tank is heavy and full of fuel, making it dangerous to handle alone.
4. Lower the tank: Carefully lower the fuel tank. You might need a jack or a suitable support system to lower it without damaging the fuel lines or the tank itself.
5. Replace the pump: Once the tank is lowered sufficiently, access the fuel pump assembly and replace it according to the instructions included with your replacement kit.
6. Reassembly: Reinstall everything in reverse order, ensuring all connections are secure, the fuel lines are correctly connected, and the tank is properly secured.
Strongly Recommended:
* Consult a repair manual: A Haynes or Chilton manual for your specific vehicle is invaluable. These manuals provide detailed diagrams and instructions.
* YouTube Tutorials: Search YouTube for "2001 GMC Sierra fuel pump replacement." You might find videos demonstrating the process, but always verify the information with your repair manual.
* Professional Mechanic: If you're not comfortable performing this repair yourself, taking it to a qualified mechanic is the safest option. Fuel system repairs are complex and require careful attention to detail.
Remember, this is a general outline. The exact steps may vary. Incorrectly performing this repair could lead to damage to your vehicle or personal injury. Always prioritize safety and consult your repair manual.
