What Causes a Strong Gasoline Smell During Cold Starts?

[LeonardoAnn]

The reasons for a strong gasoline smell during cold starts are: 1. Under very low external temperatures, when the water temperature and exhaust pipe temperature are low, combined with the extremely cold external conditions during winter engine cold starts, the air-fuel mixture becomes richer. As a result, some of the mixture does not burn completely and is directly expelled through the exhaust pipe, leading to a noticeable gasoline smell. 2. Issues with the carbon canister or carbon canister solenoid valve, causing an overly rich air-fuel mixture during startup. 3. Low local temperatures combined with excessive carbon buildup inside the engine, resulting in poor mixture atomization. 4. If the solenoid valve remains closed, gasoline vapors in the carbon canister will accumulate until the canister is full, forcing excess vapors to escape into the atmosphere. 5. Leakage from the fuel injectors leading to an overly rich mixture, with unburned mixture being expelled through the exhaust pipe.