Preparation:
1. Ensure you have the following tools and materials: Replacement fuel pump, wrenches, screwdrivers, fuel line fitting tool, fuel filter, new fuel line clamp, safety glasses, and a large container for catching any spilled fuel.
2. Jack up the rear of the vehicle or place it on ramps. Ensure the parking brake is engaged and chock the front wheels.
3. Locate the fuel pump access door under the vehicle, near the fuel tank. Remove the access door's screws or bolts to expose the fuel pump.
4. Disconnect the negative terminal of the battery to prevent any electrical accidents.
Steps to Change the Fuel Pump:
1. Disconnect Fuel Lines:
- Before disconnecting any fuel lines, cover the area around the fuel pump with rags or paper towels to catch any spills.
- Use a wrench to loosen and disconnect the fuel supply and return lines connected to the fuel pump. Be cautious as there may be some fuel pressure, so have the container ready.
2. Remove Fuel Pump Assembly:
- Use a screwdriver or wrench to remove the bolts or screws securing the fuel pump assembly.
- Carefully remove the fuel pump assembly, including the fuel pump, fuel sender, and fuel level float.
3. Inspect Fuel Filter and Sending Unit:
- Take this opportunity to inspect the fuel filter and fuel level sending unit. If they are dirty or clogged, consider replacing them simultaneously with the fuel pump.
4. Install New Fuel Pump:
- Place the new fuel pump assembly into the fuel tank.
- Secure it using the bolts or screws you removed earlier. Make sure it's tightly fastened to prevent fuel leaks.
5. Reconnect Fuel Lines:
- Reconnect the fuel supply and return lines to the appropriate connections on the fuel pump.
- Use a wrench to tighten the fittings until they are secure.
6. Reinstall Access Door:
- Reinstall the fuel pump access door and secure it with its bolts or screws.
7. Reconnect Battery:
- Go back to the front of the vehicle and reconnect the negative terminal of the battery.
8. Test the Fuel Pump:
- Turn on the ignition without starting the engine. Listen for the fuel pump to prime and build up pressure. Once the pump stops humming, the tank is pressurized.
- Start the engine and check for any leaks or unusual sounds.
9. Lower the Vehicle:
- Lower the Blazer or remove it from the ramps.
10. Check for Fuel Leaks:
- Look under the vehicle for any fuel leaks. Ensure the fuel lines are securely attached, and there are no drips or leaks.
By following these steps, you should successfully replace the fuel pump in your 1996 Chevy Blazer S10. If you encounter any difficulties or concerns during the process, it is recommended to consult a qualified mechanic for assistance.
