What Causes the Smell of Gasoline During a Cold Start of a Car?

[DiHector]

Cold start refers to starting the engine when the coolant temperature is low. The reasons for smelling gasoline during a cold start of a car are as follows: 1. Issues with the carbon canister or the carbon canister solenoid valve, causing the air-fuel mixture to be too rich during startup. 2. In winter, the low external temperature during a cold start leads to a richer air-fuel mixture. Some of the mixture cannot burn completely and is directly expelled through the exhaust pipe. 3. Excessive carbon buildup inside the engine, resulting in incomplete atomization of the air-fuel mixture. 4. Leakage in the fuel injector, leading to an overly rich air-fuel mixture, with unburned mixture being expelled through the exhaust pipe.