Tools You'll Need:
* Wrench: The size will depend on the filter's retaining bolt or clamp. Likely a 13mm or 15mm wrench (or socket set).
* Fuel line disconnect tool: This specialized tool makes disconnecting the fuel lines easier and prevents damage. You can often improvise with small flat-head screwdrivers, but a tool is safer.
* Rags or shop towels: To clean up any spilled fuel.
* New fuel filter: Make sure to get the correct filter for your Blazer's engine. Your local auto parts store can help.
* Container: To catch the remaining fuel in the lines.
* Safety glasses: Always wear safety glasses when working with fuel.
* Gloves: Protect your hands from fuel and potential dirt.
Procedure:
1. Safety First: Disconnect the negative battery terminal.
2. Locate the Fuel Filter: The fuel filter is usually located near the fuel tank, often along the frame rail. Consult your repair manual for the precise location.
3. Relief Pressure: There is pressure in the fuel lines. To relieve this pressure, you'll either need to use a pressure relief valve (if equipped) or crank the engine briefly (after the negative terminal is reconnected for a few seconds just enough to hear the fuel pump shut-off) until it stalls. Reconnect the negative battery terminal after this step. Then disconnect it again immediately after.
4. Disconnect Fuel Lines: Carefully loosen the retaining clamps or bolts on the fuel lines connected to the fuel filter. Use your fuel line disconnect tool to release the lines. Have your container ready to catch any spilled fuel.
5. Remove the Fuel Filter: Once the fuel lines are disconnected, carefully remove the fuel filter. Note the orientation of the filter – some have an arrow indicating fuel flow.
6. Install the New Fuel Filter: Install the new fuel filter, ensuring it's oriented correctly (match the arrow if applicable).
7. Reconnect Fuel Lines: Carefully reconnect the fuel lines, making sure they are securely attached.
8. Reconnect Battery Terminal: Reconnect the negative battery terminal.
9. Check for Leaks: Start the engine and check for any fuel leaks around the filter and fuel lines. Let the engine run for a few minutes.
10. Double-Check: After checking for leaks, turn the engine off and once more check all connections for leaks.
Important Considerations:
* Fuel is Flammable: Avoid sparks, open flames, and smoking near the fuel system.
* Fuel is Toxic: Work in a well-ventilated area and avoid inhaling fuel fumes.
* Proper Disposal: Dispose of the old fuel filter properly according to local regulations.
This is a general guide. If you are not comfortable performing this repair, it's best to take your Blazer to a qualified mechanic. Failure to properly replace the fuel filter can lead to engine damage. Again, consult a repair manual specific to your vehicle's year, make, model, and engine.
