Here's a general outline. Consult a repair manual specific to your 1989 Chevy S-10 Blazer's engine and fuel system for detailed instructions and torque specifications. This information is crucial and may vary slightly depending on the engine and trim level.
1. Safety First:
* Disconnect the negative battery terminal. This prevents accidental sparks.
* Work in a well-ventilated area. Fuel vapors are dangerous.
* Wear safety glasses and gloves.
* Have a fire extinguisher readily available.
2. Preparation:
* Gather your tools: This will include sockets, wrenches, screwdrivers (Phillips and flathead), pliers, fuel line disconnect tools, a fuel pump removal tool (often specialized), jack stands, jack, and possibly a fuel pressure gauge.
* Obtain a new fuel pump: Make sure it's the correct one for your vehicle.
* Drain the fuel tank: This reduces the risk of spillage and makes the job easier. You can siphon the fuel into a suitable container.
* Locate the fuel pump access panel: This is usually located under the vehicle, near the fuel tank.
3. Accessing the Fuel Pump:
* Secure the vehicle: Use jack stands to safely lift the rear of the vehicle. Never work under a vehicle supported only by a jack.
* Locate and remove the access panel: This often involves removing some screws or bolts.
* Disconnect the fuel lines: This is where specialized tools are helpful. They prevent damage to the lines. Note: You might need to relieve pressure in the fuel system before disconnecting. Some vehicles have a Schrader valve similar to a tire valve that can be used to release pressure. Be absolutely certain the vehicle is disconnected from the battery before disconnecting any fuel lines. Label the lines clearly to avoid confusion during reassembly.
* Disconnect the electrical connector: This is typically a multi-pin connector.
* Remove the fuel pump retaining ring or cover: This often requires a specialized tool.
4. Removing and Installing the Fuel Pump:
* Remove the old fuel pump: This may be attached with a retaining ring or held in place by a basket.
* Carefully compare the old and new fuel pump: Ensure they are identical.
* Install the new fuel pump: Reverse the removal process.
* Reinstall the retaining ring or cover.
5. Reassembly:
* Reconnect the electrical connector.
* Reconnect the fuel lines. Be sure they're securely attached.
* Reinstall the access panel.
* Lower the vehicle carefully.
* Reconnect the negative battery terminal.
6. Post-Installation:
* Check for leaks: Inspect all connections for leaks.
* Start the engine: Listen for unusual noises from the fuel pump.
* Check fuel pressure (if you have a gauge): This ensures the new pump is working correctly.
Important Considerations:
* Fuel pump replacement can be more challenging than it sounds. It involves working with potentially dangerous fuel and requires careful attention to detail.
* Consult a repair manual: A shop manual specific to your vehicle is invaluable. It will have diagrams, torque specifications, and step-by-step instructions that go far beyond this general overview.
* If you are uncomfortable performing this repair, take your vehicle to a qualified mechanic. This is not a job for the inexperienced.
This guide provides a general overview. Failing to follow the specific instructions for your vehicle could lead to damage or injury. Always prioritize safety and consult a repair manual before attempting this repair.
