Here's a general outline. Specific steps may vary slightly depending on your Blazer's engine (e.g., 4.3L V6, 5.3L V8). Consult a repair manual specific to your vehicle's year, make, model, and engine for precise instructions and torque specifications. A Haynes or Chilton manual is a good investment.
Tools you'll likely need:
* Socket wrench set (metric)
* Ratchet and extensions
* Fuel line disconnect tool (or appropriate pliers - be careful not to damage the lines)
* Wrenches (as needed for specific fasteners)
* Shop rags or paper towels
* Safety glasses
* Gloves
* Fuel pressure gauge (optional, but highly recommended for verifying pressure after repair)
* New fuel pressure regulator
General Steps:
1. Safety First: Disconnect the negative battery terminal.
2. Relief Fuel Pressure: This is crucial to prevent fuel spray. There are various methods; some involve using a special tool to depress the schrader valve on the fuel rail (similar to a tire valve). Consult your repair manual for the safest method for your specific vehicle. Never attempt to start the engine without proper pressure relief.
3. Locate the Fuel Pressure Regulator: It's often mounted on the fuel rail. The location will vary slightly depending on the engine. Your repair manual will show you its exact location.
4. Disconnect Fuel Lines and Electrical Connector: Carefully disconnect the fuel lines using the fuel line disconnect tool. Have rags ready to absorb any spilled fuel. Disconnect the electrical connector, if applicable.
5. Remove the Fuel Pressure Regulator: Depending on how the FPR is secured (bolts, clamps, etc.), carefully remove it from the fuel rail. Take note of the orientation and any gaskets or seals to ensure proper reinstallation.
6. Install the New Fuel Pressure Regulator: Carefully install the new FPR, ensuring that any gaskets or seals are properly seated. Make sure it's oriented correctly.
7. Reconnect Everything: Reconnect the fuel lines and the electrical connector (if applicable). Double-check all connections for leaks.
8. Reconnect the Battery: Reconnect the negative battery terminal.
9. Check for Leaks: Visually inspect all connections for leaks. Start the engine and let it idle for a few minutes. Look carefully for fuel leaks around the FPR and fuel lines.
10. Verify Fuel Pressure (Highly Recommended): Use a fuel pressure gauge to check the fuel pressure. Compare the reading to the specifications in your repair manual.
Important Considerations:
* Fuel is Flammable: Work in a well-ventilated area, away from any open flames or sparks.
* Fuel Under Pressure: Releasing fuel pressure incorrectly can result in injury or fuel spraying. Follow the instructions in your repair manual carefully.
* Repair Manual: A repair manual specific to your vehicle is essential. This outline provides a general overview; the precise steps may vary.
* Professional Help: If you're uncomfortable performing this repair yourself, it's best to take your Blazer to a qualified mechanic.
This information is for guidance only. Always refer to your vehicle's repair manual for detailed, accurate instructions. Incorrect repair can lead to damage to your vehicle or personal injury.
