Here's a general outline. This is not a complete, step-by-step guide, and you should consult a repair manual specific to your 2004 Chevy Blazer's engine (4.2L or 5.3L) for precise instructions and torque specifications. Repair manuals are available online and at auto parts stores.
Safety Precautions:
* Disconnect the negative battery terminal. This is crucial to prevent sparks near gasoline.
* Work in a well-ventilated area. Gasoline fumes are flammable and hazardous.
* Wear safety glasses and gloves.
* Have a fire extinguisher nearby.
* Use properly rated fuel-resistant hoses and clamps.
* Dispose of fuel properly according to local regulations.
General Steps (Consult your repair manual for specifics):
1. Lower the fuel tank: This usually involves removing the access panel under the vehicle, disconnecting electrical connectors and fuel lines, and then supporting and lowering the tank. This often requires special tools and jack stands. The exact method depends on whether you have a 2WD or 4WD Blazer.
2. Disconnect the fuel lines: This will involve carefully releasing the clamps and disconnecting the fuel supply and return lines. You'll likely need to use fuel line disconnect tools to prevent damage and spillage. Collect any spilled fuel immediately and properly.
3. Disconnect the electrical connector: Unplug the fuel pump electrical connector.
4. Remove the fuel pump access plate: The fuel pump is typically accessed through a plate on top of the fuel tank. This may involve removing bolts or other fasteners.
5. Remove the fuel pump assembly: The pump assembly is usually held in place by a retaining ring or clip. Remove this to lift the assembly out of the tank.
6. Install the new fuel pump assembly: Carefully install the new fuel pump assembly, ensuring it's properly seated and the retaining ring is secure.
7. Reconnect the electrical connector and fuel lines: Carefully reconnect the fuel lines and electrical connector, ensuring all clamps are securely fastened.
8. Raise the fuel tank: Carefully raise the fuel tank back into position and secure it. Reinstall any access panels.
9. Reconnect the negative battery terminal.
10. Prime the fuel system: Before starting the engine, you may need to prime the fuel system. This is usually done by turning the ignition key to the "on" position several times, allowing the fuel pump to pressurize the system.
11. Start the engine and check for leaks: Once the engine starts, check for any fuel leaks around the fuel lines and pump.
Tools you'll likely need:
* Jack and jack stands
* Socket set and wrenches
* Fuel line disconnect tools
* Screwdrivers
* Safety glasses and gloves
* Fuel pump access plate removal tools
* New fuel pump and filter
* Shop rags
* Fuel line clamps
* Repair manual specific to your 2004 Chevy Blazer
Disclaimer: This information is for general guidance only. Incorrect installation can lead to serious problems, including fire. If you are not comfortable performing this repair yourself, it's strongly recommended to take your vehicle to a qualified mechanic. Improper fuel handling can cause injury or death.
