Here's a general outline. Specific steps may vary slightly depending on engine type (small block or big block). Consult a 1968 Chevy Impala repair manual specific to your engine for detailed instructions and diagrams. These manuals are readily available online and at auto parts stores.
1. Preparation:
* Gather Tools: You'll need wrenches (various sizes), sockets, a fuel line disconnect tool (or pliers), jack stands, jack, safety glasses, gloves, rags, and a container to catch spilled fuel.
* Drain the fuel tank: This significantly reduces the risk of fuel spillage. You can siphon the fuel or use a drain valve if your tank has one.
* Disconnect the battery: This is crucial for safety.
* Raise and support the vehicle: Securely jack up the car and place it on jack stands. Never work under a car supported only by a jack.
2. Accessing the Fuel Pump:
* Locate the fuel pump: On a 1968 Impala, the fuel pump is typically mounted on the engine block, near the fuel tank. The exact location varies depending on the engine. Your repair manual will show you precisely where it is.
* Remove the fuel lines: Carefully disconnect the fuel lines leading to and from the pump. Use a fuel line disconnect tool to avoid damaging the lines. Have rags ready to absorb any spilled fuel. You'll likely need to relieve fuel pressure by starting the car and letting it run until it stalls if the fuel lines aren't already depressurized. Double check this in your manual.
* Remove the pump: This usually involves removing mounting bolts or clamps holding the pump in place. There might be a fuel pump gasket that needs to be replaced as well.
3. Installing the New Fuel Pump:
* Install the new gasket (if applicable): Ensure the gasket is properly seated before installing the new pump.
* Install the new fuel pump: Mount the new pump securely in its original location. Use the same mounting hardware as before.
* Reconnect the fuel lines: Carefully reconnect the fuel lines, ensuring they are securely fastened and tightened. Double-check all connections for leaks.
4. Final Steps:
* Lower the vehicle: Carefully lower the car from the jack stands.
* Reconnect the battery: Reconnect the negative battery terminal.
* Check for leaks: Inspect all fuel line connections for leaks.
* Start the engine: Start the engine and check for any issues, including fuel leaks, engine running issues, or unusual noises.
* Check for fuel pressure: If possible, measure the fuel pressure to verify the pump is functioning correctly. This step requires a fuel pressure gauge.
Important Considerations:
* Fuel pump replacement kit: Consider purchasing a fuel pump replacement kit, which often includes the pump, gasket, and other necessary components.
* Type of fuel pump: Make sure you purchase a fuel pump that is compatible with your vehicle's engine and fuel system.
* Repair manual: A repair manual is essential for precise instructions and diagrams specific to your 1968 Chevy Impala and its engine.
This is a simplified overview. Always refer to a repair manual specific to your vehicle for detailed instructions and safety precautions. If you are not comfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. Improperly installed fuel pumps can be dangerous.
