Why does the car smell like gasoline when starting?

[DeMia]

There are several reasons why a car may emit a gasoline smell when starting: 1. During a cold start, the ECU adjusts the fuel injection quantity based on intake temperature and coolant temperature signals. At this time, the engine has not yet reached its normal operating temperature, and the air-fuel mixture cannot fully combust. This partially unburned mixture is expelled, resulting in a gasoline smell. Once the engine reaches its normal operating temperature of 80-90 degrees Celsius, the air-fuel mixture in the cylinders burns completely, and the gasoline smell will gradually disappear. 2. If the gasoline smell persists while driving, it may indicate a misfiring cylinder in the engine. Incompletely burned gasoline is expelled through the exhaust pipe, and when the car decelerates, the smell enters the cabin. (A car with a misfiring cylinder will exhibit noticeable shaking when starting or idling. If a misfire is confirmed, it should be repaired promptly.) 3. Driving too close to the car in front may allow exhaust from that car to enter your vehicle through the air conditioning ducts. Alternatively, if your windows are not fully closed, exhaust fumes may enter the cabin. Drive for a while to confirm whether the gasoline smell persists.