1. Fuel Supply:
* Empty Tank: The most obvious – check the fuel gauge and actually look in the tank.
* Fuel Pump: The fuel pump might be faulty (not running, weak output). This could be due to a blown fuse, failed relay, or a worn-out pump itself. Listening for a humming sound from the tank (when the ignition is turned on) can help diagnose the pump.
* Fuel Filter: A clogged fuel filter will restrict fuel flow. It's relatively inexpensive and easy to replace.
* Fuel Tank Sender Unit: This unit measures the fuel level and can also affect fuel flow if faulty.
2. Fuel Delivery:
* Fuel Lines: Check for leaks, cracks, or kinks in the fuel lines running from the tank to the engine. Look carefully – fuel leaks can be subtle.
* Fuel Injectors: Clogged or faulty injectors won't spray fuel into the cylinders. This requires more advanced diagnostic tools to check.
* Fuel Pressure Regulator: This maintains the correct fuel pressure. A faulty regulator could lead to low or inconsistent pressure.
3. Ignition System (indirectly related):
While not directly about gas delivery, a faulty crankshaft position sensor (CKP) or camshaft position sensor (CMP) can prevent fuel injection even if there's gas available. The engine computer needs these signals to time the fuel injection.
4. Engine Control Module (ECM): A malfunctioning ECM can cut off fuel delivery. This is less likely but possible. A professional diagnostic scan tool is needed for this.
Troubleshooting Steps:
1. Start Simple: Check the fuel level first.
2. Listen for the Fuel Pump: Turn the ignition key to the "on" position (without starting the engine). You should hear a brief humming sound from the fuel tank area. If not, check the fuel pump relay and fuse.
3. Visual Inspection: Carefully inspect the fuel lines for damage or leaks.
4. Fuel Filter: Replace the fuel filter. It's a relatively cheap and easy fix that often solves the problem.
5. Fuel Pressure Test: If you have the tools and knowledge, performing a fuel pressure test is crucial. This will tell you definitively if you have sufficient fuel pressure reaching the injectors.
When to Seek Professional Help:
If you're uncomfortable working with fuel systems (fuel is flammable and potentially dangerous), or if you've checked the simple things and are still having issues, take your vehicle to a qualified mechanic. They have diagnostic tools to identify more complex problems. They can also perform a fuel pressure test and check for problems with the fuel injectors or ECM.
