Why is there a strong gasoline smell during cold starts?

[DelAmir]

The reasons for a strong gasoline smell during cold starts: 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 cannot be fully burned and is directly expelled through the exhaust pipe, leading to a noticeable gasoline smell. This is a normal phenomenon. 2. Issues with the carbon canister or carbon canister solenoid valve, causing an overly rich mixture during startup. 3. Low local temperatures combined with excessive carbon buildup inside the engine can result in poor mixture atomization, which can also cause this phenomenon. 4. If the solenoid valve remains closed, gasoline vapors in the carbon canister accumulate and eventually fill the entire canister, with the excess vapors escaping into the atmosphere, leading to a gasoline smell. 5. Leaking fuel injectors can cause an overly rich mixture, and the unburned mixture is expelled through the exhaust pipe, resulting in a strong gasoline smell.