* Fuel Pump Failure: The most common culprit. A faulty fuel pump can't deliver fuel to the fuel rail, preventing it from reaching the injectors at the throttle body. This could be due to a burnt-out motor, clogged filter within the pump, or electrical issues.
* Fuel Pump Relay Failure: The fuel pump is controlled by a relay. A bad relay won't allow power to reach the pump.
* Clogged Fuel Filter: A severely clogged filter restricts fuel flow to the point where insufficient fuel reaches the throttle body.
* Fuel Injectors: Faulty injectors might be clogged, stuck closed, or have electrical problems preventing them from spraying fuel. This is less likely to completely prevent *all* fuel delivery, but a complete failure of all injectors is possible.
* Fuel Pressure Regulator: A faulty regulator might not maintain the correct fuel pressure in the fuel rail, leading to insufficient fuel delivery.
* Low Fuel Level: Seems obvious, but an extremely low fuel level can sometimes cause issues with fuel pump pickup.
* Wiring Issues: Problems with the wiring harness leading to the fuel pump, injectors, or other fuel system components can interrupt power and signal flow. This could include corroded connections, broken wires, or damaged connectors.
* PCM (Powertrain Control Module) Problem: The PCM controls many aspects of the fuel system. A malfunctioning PCM might not send the correct signals or might even shut down fuel delivery due to a detected fault.
* Fuel Line Restriction or Leak: A kinked, blocked, or leaking fuel line between the tank and the engine will prevent or reduce fuel flow.
Troubleshooting Steps (Proceed with caution, fuel is flammable):
1. Check the fuel level: The simplest step first.
2. Listen for the fuel pump: Turn the ignition key to the "on" position (without starting the engine). You should hear a brief whirring sound from the fuel pump (usually located near the fuel tank). If you don't hear it, suspect the pump, relay, or wiring.
3. Check fuel pressure: This requires a fuel pressure gauge. You need to know the correct specifications for your particular engine to determine if the pressure is within range.
4. Inspect fuel lines and filter: Look for any visible damage, leaks, or kinks in the lines. Replace the fuel filter if it's old or suspected of being clogged.
5. Check fuel injectors (advanced): This often requires specialized tools and knowledge. A professional mechanic is usually best suited for this.
6. Diagnose electrical components: Use a multimeter to test the fuel pump relay, fuses, and wiring for power and continuity.
Important Note: Working on the fuel system involves working with flammable materials. Take all necessary precautions to avoid fire or explosion. If you're not comfortable working with fuel systems, take your vehicle to a qualified mechanic for diagnosis and repair. Improper handling can lead to serious injury or damage.
