Here's a general outline. Specifics might vary slightly depending on your exact Silverado model (1500, 2500, etc.) and options. Always consult a repair manual specific to your truck for detailed instructions and diagrams.
1. Preparation:
* Safety First: Disconnect the negative battery terminal.
* Gather Tools: You'll need jack stands, jack, various sockets and wrenches (including those for fuel lines), screwdrivers, fuel line disconnect tool (essential!), safety glasses, gloves, rags, and possibly a fuel pump removal tool.
* Drain the Tank (Highly Recommended): This significantly reduces the risk of spillage. Use a siphon pump or a drain valve if equipped.
* Locate the Tank: It's typically under the bed, near the rear axle.
2. Accessing the Tank:
* Lower the Truck: Securely lift and support the truck using jack stands. Never work under a vehicle supported only by a jack.
* Remove Bed Access Panels: You'll likely need to remove some panels or components under the truck bed to get to the tank.
* Disconnect Fuel Lines: This is crucial. Use the fuel line disconnect tool to carefully release the fuel lines from the tank. Be prepared for some fuel spillage, even if you drained the tank. Have rags ready.
* Disconnect Electrical Connections: Disconnect the fuel pump wiring harness connector and the fuel level sensor connector.
* Disconnect Vent Line: Locate and disconnect the vent line from the tank.
* Unbolt the Tank Straps: Carefully remove the straps or bolts securing the tank to the vehicle's frame. These may be difficult to reach.
3. Removing the Tank:
* Lower the Tank: Gently lower the tank. It may be heavy and awkward. Have assistance if possible.
* Support the Tank: Be extremely careful not to damage the tank. It's best to have something soft to rest the tank on as you remove it.
4. Replacing the Fuel Pump:
* Access the Pump: Once the tank is out, you'll need to access the fuel pump assembly. This typically involves removing a cover plate on top of the tank.
* Remove the Old Pump: Consult your repair manual for specifics on how to remove the old pump.
* Install the New Pump: Install the new pump, ensuring it's seated correctly. Follow the instructions that came with the new fuel pump.
5. Reassembly:
* Reinstall the Pump and Tank: Reverse the removal steps to reinstall the tank and fuel pump. Be sure all connections are secure.
* Tighten Straps: Ensure the tank straps are securely tightened.
* Reconnect Everything: Reconnect all fuel lines, electrical connections, and the vent line. Double-check all connections.
* Raise the Truck: Carefully raise the truck.
* Reconnect the Battery: Reconnect the negative battery terminal.
* Check for Leaks: Before driving, check for any fuel leaks around the tank and lines.
Important Considerations:
* Fuel Pressure: After reassembly, you may need to prime the fuel system. Consult your repair manual for the correct procedure.
* Professional Help: If you're not comfortable with this repair, it's best to take your truck to a qualified mechanic. Improperly handling fuel lines or not correctly securing the tank could lead to serious injury or damage.
This is a general guide. Always refer to a repair manual specific to your 1994 Chevrolet Silverado for detailed, illustrated instructions and torque specifications. Safety is paramount, so take your time and prioritize safety throughout the entire process.
