Fuel Delivery System Issues:
* Empty Fuel Tank: The most obvious reason! Check your fuel gauge.
* Blocked Fuel Filter: A clogged fuel filter restricts fuel flow to the engine.
* Faulty Fuel Pump: The fuel pump moves fuel from the tank to the engine. A weak or failed pump won't deliver enough fuel. This can be intermittent – sometimes working, sometimes not.
* Clogged Fuel Lines: Debris or corrosion can restrict fuel flow in the lines.
* Fuel Pump Relay: This electrical component controls the fuel pump. A faulty relay prevents the pump from turning on.
* Fuel Pressure Regulator: This regulates the fuel pressure in the system. A malfunctioning regulator can lead to inconsistent fuel delivery.
* Leaking Fuel Injector(s): If the injectors are leaking, fuel might not reach the engine effectively. This is often accompanied by rough running or poor performance.
* Clogged Fuel Injectors: Similar to fuel lines, injectors can become clogged, preventing fuel from spraying into the engine's cylinders.
Other Potential Problems:
* Ignition System Issues: While not directly related to fuel delivery, problems with the ignition system (spark plugs, ignition coils, etc.) can prevent the engine from running even if there's fuel present. The car might crank but not start.
* Engine Control Module (ECM) Problems: The ECM controls various aspects of the engine, including fuel delivery. A malfunctioning ECM can cause erratic or absent fuel supply. This often presents as a "no start" condition with other diagnostic trouble codes.
Troubleshooting Steps (In order of easiest to hardest):
1. Check the fuel gauge: Is the tank empty?
2. Listen for the fuel pump: When you turn the ignition key to the "on" position (but don't start the engine), you should hear a brief hum from the fuel pump. If you don't hear it, the pump or its relay might be faulty.
3. Check the fuel filter: If it's visibly dirty or clogged, it needs replacing.
4. Have a mechanic diagnose the issue: This is important, as many of the problems listed above require specialized tools and knowledge to pinpoint accurately.
It's crucial to get a professional diagnosis if you're experiencing consistent fuel delivery problems. Attempting repairs without proper knowledge can be dangerous and potentially damage your vehicle further.
