1. Fuel Pump: This is a very common cause.
* Listen for the fuel pump: Have someone turn the key to the "ON" position (don't crank the engine). You should hear a brief humming sound from the fuel tank area. If you don't hear it, the fuel pump relay or the pump itself might be faulty.
* Check the fuel pump relay: Locate the fuel pump relay (consult your owner's manual or online resources for its location). You can try swapping it with a known good relay of the same amperage (be cautious, ensure the correct relay is used).
* Check the fuel pump fuse: Similar to the relay, check the fuse associated with the fuel pump.
* Low fuel: Sounds obvious, but make sure the tank isn't nearly empty!
2. Fuel Filter: A clogged fuel filter restricts fuel flow.
* Locate and inspect the fuel filter: Replace if dirty or damaged.
3. Fuel Pressure Regulator: This regulates fuel pressure in the fuel rail. A faulty regulator can lead to low or no fuel pressure.
* Pressure test: This requires a fuel pressure gauge and is best done by a mechanic.
4. Fuel Injectors: Clogged or faulty injectors prevent fuel from entering the engine's cylinders.
* Testing requires specialized tools and knowledge: A mechanic will need to diagnose this.
5. Wiring and Connections: Damaged wiring or loose connections in the fuel system can interrupt fuel delivery.
* Inspect wiring: Check for any visual damage, corrosion, or loose connections related to the fuel pump, fuel injectors, and other fuel system components.
6. Crankshaft Position Sensor (CKP Sensor): While not directly related to fuel delivery, a faulty CKP sensor can prevent the engine from starting, even if there's fuel. The PCM needs this signal to time the fuel injection.
7. PCM (Powertrain Control Module): The PCM controls various aspects of the engine, including fuel delivery. A faulty PCM is less likely but possible. Diagnosing this is difficult and usually requires professional help.
What to do next:
1. Start with the easiest checks: Listen for the fuel pump, check the fuses and relays.
2. If you hear the pump: Proceed to check the fuel filter. A clogged filter is an inexpensive fix.
3. If problems persist: Consider getting a fuel pressure test performed by a mechanic. This will pinpoint whether the issue lies within the pump or further down the line.
Safety Precautions:
* Work in a well-ventilated area: Fuel is flammable.
* Disconnect the battery's negative terminal before working on any fuel system components.
* Be careful when handling fuel: Avoid spills and skin contact.
If you're not comfortable working on your vehicle yourself, take it to a qualified mechanic. They have the tools and expertise to diagnose and repair the problem safely and efficiently. Providing them with the information you gathered from these basic checks will greatly help them in their diagnosis.
