Tools You'll Need:
* Fuel pressure gauge: This is specifically designed for fuel systems and usually connects to the Schrader valve (like a tire valve) on the fuel rail.
* Socket wrench: You'll need the correct size to remove the fuel pump relay (location varies slightly depending on the trim level).
* Shop rags or paper towels: For cleaning up any spilled fuel.
* Safety glasses: Protect your eyes.
* Gloves: Protect your hands from gasoline.
* Repair Manual: Consult this for your specific Blazer's specifications (fuel pressure specs, relay location etc.).
Procedure:
1. Safety First: Disconnect the negative (-) battery cable to prevent accidental sparking. Allow several minutes for the vehicle's electrical system to fully discharge.
2. Locate the Fuel Rail Schrader Valve: This valve is usually located on the fuel rail, which is a metal pipe running along the top of the engine. It looks similar to a tire valve stem.
3. Locate and Remove the Fuel Pump Relay: This step reduces the risk of damage to the fuel pump. Consult your repair manual for the exact location of the relay (usually in the underhood fuse box or inside the passenger compartment fuse box).
4. Connect the Fuel Pressure Gauge: Carefully connect the fuel pressure gauge to the Schrader valve.
5. Start the Engine: Have someone crank the engine while you carefully monitor the gauge. The pressure should build quickly.
6. Record the Pressure: Once the pressure stabilizes, note the reading on the gauge. Your repair manual will specify the correct fuel pressure for your engine. Readings that are too high or too low indicate potential problems.
7. Turn Off the Engine: Once you've recorded the pressure, turn off the engine.
8. Release Pressure (Important): Carefully depress the Schrader valve on the fuel rail using a small tool or the gauge itself. This releases the pressure in the fuel system. This is crucial to prevent fuel from spraying when disconnecting the gauge.
9. Reconnect the Fuel Pump Relay: Reinstall the fuel pump relay.
10. Reconnect the Battery Cable: Reconnect the negative (-) battery cable.
Interpreting Results:
Compare your reading to the specifications in your repair manual. Low fuel pressure can be caused by a failing fuel pump, clogged fuel filter, leaking injectors, or other issues. High fuel pressure might indicate a problem with the fuel pressure regulator.
Important Notes:
* Fuel is flammable and potentially dangerous. Work in a well-ventilated area away from any ignition sources.
* If you are uncomfortable performing this procedure, take your Blazer to a qualified mechanic. Improper handling of fuel can be hazardous.
* Always consult your vehicle's repair manual for precise details and specifications. The procedures and locations might vary slightly between Blazer models and engine types.
This is a general guide, and the specific steps may vary slightly depending on your 1996 Chevy Blazer's engine and configuration. Always refer to your vehicle's repair manual for detailed instructions and safety information before attempting any repairs.
