Before you begin:
* Safety First: Disconnect the negative battery terminal. This prevents accidental sparks that could ignite fuel vapors.
* Gather your tools: You'll need a socket set (including various sizes), wrenches, a fuel pump removal tool (often a specialized socket or strap wrench), a fuel line disconnect tool, jack stands, safety glasses, gloves, rags, and a new fuel pump (ensure it's the correct one for your specific engine). A fuel pressure gauge is helpful but not strictly necessary.
* Consult a repair manual: A Chilton's or Haynes repair manual specific to your 1996 GMC Jimmy is invaluable. It will provide detailed diagrams and instructions specific to your vehicle. This is strongly recommended.
* Properly dispose of fuel: You will likely need to handle some fuel during this process. Do so carefully and dispose of any spilled fuel responsibly.
General Steps (refer to your repair manual for precise details):
1. Vehicle Preparation: Secure the vehicle safely on jack stands. Disconnect the negative battery cable.
2. Fuel System Pressure Relief: This is crucial for safety. The method varies slightly depending on your engine but generally involves removing the fuel pump relay or disconnecting the fuel pump's electrical connector. Then, crank the engine briefly to deplete the fuel pressure in the lines. Check your repair manual for the precise procedure.
3. Access the Fuel Pump: This is the most labor-intensive part. It typically involves:
* Dropping the fuel tank: This is often necessary. You'll need to disconnect the fuel lines (use the disconnect tool to avoid damaging the lines), the electrical connector, and the tank's retaining straps. The tank is usually heavy, so use caution and appropriate lifting techniques.
* Accessing a fuel pump access panel: Some models may have an access panel on the bottom of the vehicle, allowing easier access to the fuel pump without dropping the tank. Check your repair manual.
4. Fuel Pump Removal: Once you've accessed the pump, use the fuel pump removal tool to carefully remove the pump from the tank. Be gentle to avoid damaging the tank or the pump's electrical connections.
5. Installation of the New Fuel Pump: Install the new fuel pump, ensuring the gasket or seal is correctly positioned.
6. Reassembly: Carefully reassemble everything in reverse order of disassembly. Double-check all connections (fuel lines, electrical connector).
7. Reconnect Fuel Lines and Electrical Connector: Make sure all fuel lines are securely attached and the electrical connector is correctly plugged in.
8. Lower the Fuel Tank (if applicable): Carefully lower the fuel tank back into place, securing it with the retaining straps.
9. Reconnect the Battery: Reconnect the negative battery cable.
10. Prime the Fuel System: Turn the ignition key to the "on" position several times (without starting the engine) to allow the fuel pump to prime the system. This ensures fuel reaches the engine.
11. Start the Engine: Start the engine and check for leaks. Listen for the fuel pump to operate normally.
12. Test Drive: Take the vehicle for a short test drive to ensure everything is working correctly.
Important Considerations:
* Fuel spillage: Take extreme caution to avoid fuel spills. Fuel is flammable and harmful.
* Static electricity: Ground yourself before working with the fuel system to prevent sparks.
* Professional Help: If you're uncomfortable with any of these steps, take your vehicle to a qualified mechanic. This repair can be more complex than it sounds, and improper work can lead to significant damage or injury.
This is a general overview. Always refer to a repair manual specific to your 1996 GMC Jimmy for detailed instructions and diagrams. The steps and procedures might vary slightly depending on the engine and options your vehicle has. Safety should always be your top priority.
