What are the reasons for a car suddenly failing to start after refueling?
2 Answers
The reasons for a car suddenly failing to start after refueling are as follows: 1. Poor combustion; 2. Low ignition energy: excessive spark plug gap, aging ignition coil, aging or leakage of the spark plug's high-voltage wire; 3. In closed-loop control vehicles, the minimum operating temperature of the oxygen sensor is 370 degrees Celsius. If the car has just been started, the temperature in the exhaust pipe may not reach 370 degrees Celsius, causing the oxygen sensor to not function. At this time, the ECU makes incorrect judgments, leading to errors in controlling the air-fuel mixture and ignition timing through the actuators, thereby reducing the car's power output and causing shaking; 4. Carbon deposits on the valves and intake passages; 5. Malfunctioning water temperature sensor; 6. Dirty air flow meter, resulting in reduced air intake; 7. Poor working condition of the EGR (Exhaust Gas Recirculation) valve, introducing exhaust gas during idle; 8. Poor fuel quality, failing to meet the required heat value.
I encountered the same situation yesterday! After filling up the tank, the car suddenly wouldn't start, which made me sweat with anxiety. Later, the mechanic told me a few common reasons: it could be that poor-quality fuel with impurities entered the tank, clogging the fuel supply line; or the charcoal canister might be blocked, preventing fuel vapors from escaping and causing pressure buildup in the tank; another possibility is the fuel level float getting stuck at the full position, giving a false reading on the fuel gauge. It's best to first unscrew the fuel cap and listen for a 'hiss—' sound of air escaping—if you hear it, it's a tank pressure issue. In such cases, don't force-start the car as it can easily damage the starter motor; calling a tow truck is the safest option.
