1. Safety First:
* Disconnect the battery: This is crucial to prevent accidental sparks.
* Ventilate the area: Work in a well-ventilated area away from open flames. Gasoline fumes are highly flammable.
* Wear safety glasses and gloves: Protect yourself from potential hazards.
* Use jack stands: Never work under a vehicle supported only by a jack.
2. Preparation:
* Locate the fuel tank: It's usually located under the rear of the vehicle.
* Gather your tools: You'll likely need:
* Jack and jack stands
* Wrench set (various sizes)
* Socket set (various sizes)
* Screwdrivers (Phillips and flathead)
* Fuel line disconnect tools
* Drain pan for fuel
* Safety glasses and gloves
* Shop rags
* Possibly a fuel pump removal tool (depending on the method)
3. Fuel System Depressurization:
* Start the engine and let it run until it stalls: This will use up any pressure in the fuel system. Do this in a well-ventilated area.
* Turn the ignition key to the "ON" position (do not crank) for a few minutes: This will further deplete the fuel pressure. This is more reliable than just letting it run until it stalls.
4. Disconnect Fuel Lines:
* Locate the fuel lines: These are usually connected to the tank near the sending unit.
* Carefully disconnect the fuel lines: Use the proper fuel line disconnect tools to avoid damaging the lines or spilling fuel. Have your drain pan ready.
* Plug the fuel lines: To prevent fuel leaks and fumes.
5. Disconnect Electrical Connections:
* Locate the fuel tank electrical connector(s): This will be the fuel pump wiring and usually a fuel level sensor.
* Carefully disconnect these connectors.
6. Remove Fuel Tank Straps/Supports:
* Locate the fuel tank straps or mounting brackets: These usually attach to the vehicle's frame.
* Use the appropriate wrenches or sockets to remove the straps or brackets. Note the location and how things are attached in case you need this information for reinstallation.
7. Lower the Tank:
* Carefully lower the fuel tank: It's heavy and may require assistance. You may need to use a block of wood or other support to prevent it from hitting the ground too hard.
8. Disconnect the Fuel Sender Unit (if needed):
* Some repairs require the removal of the fuel sender unit which sits inside the tank. This usually requires removal of the retaining ring and involves some additional steps. This depends entirely on what your reason is for removing the tank.
9. Drain Remaining Fuel (if necessary):
* There might be some remaining fuel in the tank after disconnecting the fuel lines - drain this into your container.
10. Reinstallation:
Reinstallation is the reverse of removal. Make sure everything is securely connected before lowering the tank. Always double-check all connections to ensure there are no leaks or loose wiring before driving the vehicle.
Important Considerations:
* Consult a repair manual: A factory service manual will provide detailed, model-specific instructions and diagrams. This is strongly recommended.
* Fuel system safety: Gasoline is highly flammable. Work in a well-ventilated area and take all necessary precautions.
* Weight of the tank: The fuel tank is heavy; consider getting assistance.
* Rust and corrosion: Inspect the fuel tank straps and other components for signs of rust and corrosion. Replace if necessary.
This is a simplified overview. Improperly removing or reinstalling the gas tank can lead to damage to your vehicle or personal injury. If you're not comfortable performing this task, it's best to take your Suburban to a qualified mechanic.
