Here's a general outline. Specific steps might vary slightly depending on the engine (e.g., 4.3L, 5.7L, etc.) and whether you have a tank-mounted or in-line pump. Always consult a repair manual specific to your Blazer's year, engine, and trim level for detailed instructions and diagrams. This is not a substitute for a professional repair manual.
1. Preparation:
* Safety First: Disconnect the negative battery terminal.
* Gather Tools: You'll need jack stands, a jack, socket wrenches (various sizes), fuel line disconnect tools, a fuel pump pliers (highly recommended), possibly a fuel pressure gauge, new fuel pump, new fuel filter (recommended), rags, safety glasses, and gloves.
* Drain the Fuel Tank (Highly Recommended): This significantly reduces the amount of fuel you'll be working around, making the job safer and cleaner. You can siphon the fuel carefully into an approved container.
2. Accessing the Fuel Pump:
* Lower the Fuel Tank: This is usually the most challenging part. You'll likely need to:
* Raise the vehicle securely using jack stands.
* Locate the fuel tank straps and disconnect them. These are often bolts or clips.
* Disconnect the fuel lines (carefully! Use the disconnect tools to avoid damage or fuel spillage). You might need to relieve fuel pressure first using the fuel pressure gauge.
* Disconnect the electrical connector to the fuel pump.
* Carefully lower the fuel tank. You might need to support it with a jack or straps as you work.
* Alternative (some models): Some 1997 Blazers might have access to the fuel pump through an access panel in the bed (if it's a Blazer with a rear cargo area) or through the rear seat. Check your repair manual.
3. Replacing the Fuel Pump:
* Remove the fuel pump assembly: This often involves removing a retaining ring or bolts to access the pump itself. This is where the fuel pump pliers are essential.
* Install the new fuel pump: Carefully install the new fuel pump assembly, making sure the gasket seals properly.
* Reassemble: Reinstall the retaining ring or bolts.
4. Reinstallation:
* Raise the fuel tank: Carefully raise the fuel tank back into position.
* Reconnect everything: Reconnect the fuel lines, electrical connector, and fuel tank straps. Double-check all connections.
* Lower the vehicle: Carefully lower the vehicle from the jack stands.
5. Final Steps:
* Reconnect the battery: Reconnect the negative battery terminal.
* Prime the Fuel System: You may need to crank the engine several times (without actually starting it) to prime the fuel pump and system before attempting to start the vehicle.
* Check for Leaks: Inspect all fuel connections for leaks.
* Test Drive: Take the vehicle for a test drive to ensure the fuel pump is working correctly.
Disclaimer: This is a general guide. Improperly replacing a fuel pump can lead to vehicle damage or even injury. If you are not comfortable performing this repair yourself, take your Blazer to a qualified mechanic. Always consult a repair manual specific to your vehicle's year, make, model, and engine for accurate and detailed instructions.
