* No start: The engine cranks but won't fire.
* Hard start: The engine starts slowly or after several attempts.
* Stalling: The engine dies unexpectedly while running.
* Rough running/misfire: The engine runs poorly, shakes, or hesitates.
* Reduced power: The engine lacks power or acceleration.
* Fuel gauge inaccuracy: The fuel gauge shows an incorrect fuel level.
* Fuel leaks: You see fuel leaking from the vehicle.
Once you identify the specific symptom, we can delve into potential causes. However, I can give you some general areas to check, keeping in mind safety is paramount. Work in a well-ventilated area and never work near an open flame while dealing with fuel systems.
General Troubleshooting Steps (for many fuel-related issues):
1. Check the fuel level: Sounds obvious, but an empty tank is the simplest explanation for no-start!
2. Inspect fuel lines and connections: Look for any visible cracks, leaks, or loose connections in the fuel lines running from the tank to the engine. Pay close attention to the connections at the fuel tank, fuel pump, and fuel injectors.
3. Check the fuel filter: A clogged fuel filter restricts fuel flow. It's relatively inexpensive and easy to replace (location varies by year and model; consult your owner's manual).
4. Inspect the fuel pump: A faulty fuel pump can't deliver enough fuel pressure. This often requires specialized tools and knowledge to diagnose (e.g., fuel pressure testing). Symptoms of a bad fuel pump include difficulty starting, sputtering, and loss of power.
5. Check the fuel injectors: Clogged or malfunctioning fuel injectors can prevent proper fuel delivery to the cylinders. Diagnosing this usually involves specialized tools and testing.
6. Inspect the fuel pressure regulator: This regulates fuel pressure within the system. A faulty regulator can lead to inconsistent fuel delivery.
7. Check the mass airflow sensor (MAF sensor): This sensor measures the amount of air entering the engine. A faulty MAF sensor can cause incorrect fuel/air mixture, leading to poor performance.
8. Check the spark plugs and ignition system: While primarily ignition issues, problems here can mimic fuel problems. Weak or fouled spark plugs can prevent the fuel from igniting properly.
9. Check the PCM (Powertrain Control Module): The PCM controls many aspects of the fuel system. A faulty PCM can cause a wide range of fuel-related problems. Diagnosis usually requires a scan tool to read diagnostic trouble codes (DTCs).
Important Note: Many of these steps require specialized tools and knowledge. If you're not comfortable working on your vehicle's fuel system, take it to a qualified mechanic. Incorrectly handling fuel systems can be dangerous. Providing your Ford Explorer's year and engine will allow for more specific advice.
