Here's a general outline. This is NOT a comprehensive guide and should not be taken as the only source of information. Consult a repair manual specific to your vehicle for detailed instructions, diagrams, torque specifications, and safety precautions. Improper procedures can lead to injury or damage to your vehicle.
1. Preparation:
* Safety First: Disconnect the negative battery cable. Work in a well-ventilated area. Have fire extinguisher readily available. Wear safety glasses and gloves.
* Gather Tools: You'll need jack stands, jack, socket set (metric), wrenches, fuel line disconnect tools, pliers, screwdrivers, a fuel pump removal tool (often a specialized tool, sometimes you can improvise with a sturdy hook), and possibly a new fuel filter. A shop manual will specify the correct sockets and wrenches.
* Obtain Parts: Get a new fuel pump assembly (it's usually sold as a complete unit), fuel filter (if needed), and any new gaskets or o-rings.
2. Accessing the Fuel Pump:
* Lower the Fuel Tank: This is the most challenging part. You'll likely need to lower the fuel tank to access the pump. This usually involves:
* Drain the fuel tank: Use a siphon pump to safely remove the fuel into a suitable container.
* Disconnect fuel lines: Carefully disconnect the fuel lines using the appropriate disconnect tools. Be prepared for some fuel spillage – use rags to absorb it. Note: The fuel lines are under pressure, even after the tank is drained. Release the pressure carefully to avoid splashing.
* Disconnect electrical connectors: Disconnect the fuel pump wiring harness connector.
* Detach fuel tank straps/supports: There are straps holding the tank in place. These will likely require loosening or removal. Your repair manual will show you exactly where they are. You may need to support the tank as you lower it.
* Carefully lower the tank: Support the tank with jack stands, as it can be heavy.
3. Replacing the Fuel Pump:
* Access the Pump: Once the tank is lowered enough, you should be able to access the fuel pump assembly located on top of the tank.
* Remove the Old Pump: Use the fuel pump removal tool to carefully remove the retaining ring or clip holding the fuel pump in place. Then carefully lift out the old pump assembly.
* Install the New Pump: Carefully install the new fuel pump assembly, making sure it sits correctly and the o-rings/gaskets are properly seated. Secure it with the retaining ring or clip.
4. Reassembly:
* Reinstall the Fuel Tank: Raise the fuel tank back into its position and securely attach the straps/supports.
* Reconnect Fuel Lines: Connect the fuel lines, ensuring a secure and leak-free connection.
* Reconnect Electrical Connectors: Reconnect the fuel pump wiring harness connector.
* Reconnect Battery Cable: Reconnect the negative battery cable.
* Check for Leaks: Inspect all connections for leaks.
* Prime the Fuel System: You may need to prime the fuel system – your repair manual will give you instructions on how to do this. This may involve several cycles of the ignition key or a special priming tool.
* Start the Engine: Carefully start the engine and check for leaks or any unusual noises.
Important Considerations:
* Repair Manual: A repair manual specific to your 1997 GMC Suburban 1500 is absolutely crucial. It will provide detailed step-by-step instructions, diagrams, torque specifications, and safety information.
* Fuel Safety: Work in a well-ventilated area, away from ignition sources. Have a fire extinguisher nearby. Dispose of old fuel properly.
* Professional Help: If you are not comfortable performing this repair yourself, take your vehicle to a qualified mechanic. This job involves working with fuel and can be dangerous if not done correctly.
This is a simplified overview; there are many nuances depending on the specific year and model of your vehicle. Always consult a repair manual specific to your vehicle for detailed and accurate instructions before attempting this repair. Safety should always be your top priority.
