What Causes the Smell of Gasoline During Cold Start?
1 Answers
Reasons for strong gasoline smell during cold start: If it's a carburetor vehicle, it's a normal phenomenon due to incomplete combustion during startup. For fuel-injected vehicles, it can be preliminarily judged as a damaged activated carbon canister. Here is some extended information: 1. Low Temperature: When the external temperature is very low, and both the water temperature and exhaust pipe temperature are low, combined with the cold engine start in winter, the air-fuel mixture becomes richer. As a result, some of the mixture cannot burn completely and is directly expelled through the exhaust pipe, leading to a noticeable gasoline smell. This is normal. 2. Carbon Canister Malfunction: Another reason could be issues with the carbon canister or the carbon canister solenoid valve, causing an overly rich air-fuel mixture during startup. 3. Excessive Engine Carbon Buildup: If the local temperature is low and there is excessive carbon buildup inside the engine, it can lead to poor atomization of the air-fuel mixture, resulting in this phenomenon. 4. Solenoid Valve Closed: If the solenoid valve remains closed, gasoline vapor in the carbon canister will accumulate and eventually fill the entire canister. The excess vapor will then escape into the atmosphere, causing a gasoline smell. 5. Fuel Injector Leakage: If the fuel injector is leaking, it can cause an overly rich air-fuel mixture. The unburned mixture will be expelled through the exhaust pipe, leading to a strong gasoline smell.
