If your Blazer is turning over but not starting up, and you've already replaced the fuel filter and fuel pump, here are a few other things you can check:
Fuel pump fuse: Although you mentioned you couldn't find a fuse for the fuel pump, it's worth double-checking your vehicle's fuse box or fuse panel diagram to confirm if there is a dedicated fuse for the fuel pump. If there is, ensure that the fuse is intact and not blown.
Fuel pump relay: You mentioned testing and replacing the fuel pump relay, but if the issue persists, it's worth checking the wiring and connections associated with the relay. Ensure that the relay is receiving power and that the connections are clean and secure. Additionally, verify that the relay is properly grounded.
Inertia switch: Some vehicles, including certain models of Blazers, may have an inertia switch that cuts off power to the fuel pump in the event of a collision or impact. This switch is typically located in the passenger compartment and may need to be reset if it has been tripped. Consult your vehicle's manual or look for information specific to your Blazer model to locate and check the inertia switch.
Check for fuel pressure at the fuel rail: Use a fuel pressure gauge to verify if there is proper fuel pressure at the fuel rail. Connect the gauge to the Schrader valve on the fuel rail and turn the ignition on. If there is no or low fuel pressure, it could indicate an issue with the fuel delivery system or a potential blockage in the fuel lines.
Ignition system: While the issue seems fuel-related, it's also worth considering the ignition system. Check for spark by removing a spark plug wire, inserting a spark plug, grounding the plug, and cranking the engine to see if there is a spark. If there is no spark, it could be due to a faulty ignition coil, ignition module, or other ignition components.
Wiring and grounds: Inspect the wiring harnesses, connectors, and grounds associated with the fuel system, including the fuel pump, relay, and related components. Look for any signs of damage, corrosion, or loose connections. Ensure that all connections are clean, tight, and properly grounded.
If you've gone through these steps and are still unable to resolve the issue, it may be best to consult a professional mechanic or an automotive technician who can perform a thorough diagnostic inspection using specialized tools and expertise to pinpoint the exact cause of the no-start condition in your Blazer.
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Sunday, November 23rd, 2008 AT 7:26 PM
