What causes a strong smell of gasoline after a car starts?

The reasons why a car has a strong gasoline smell after starting include: incomplete combustion of gasoline, aging of rubber hoses, and leakage at the connection points with gasoline pipes.

Due to incomplete combustion of gasoline: The smell of gasoline is very strong when the car starts. If it disappears after heating, this is a normal phenomenon because the combustion effect is not good when the car is just started. When starting a cold vehicle, the water temperature and exhaust pipe temperature are low, and at this time the mixture is thicker. So, some mixtures cannot be completely burned. When they are discharged from the exhaust pipe, a strong smell of gasoline can be detected.

Rubber hose aging: The rubber hoses in the engine compartment will age over long-term use, which is very likely to occur in old vehicles. Once they get old, gasoline will leak into the engine compartment, and the air conditioning system will allow the smell of gasoline to enter the car. So, once the rubber hoses age, they need to be replaced in time.

Gas leakage at the connection of the gasoline pipe: There is a gas leakage at the interface of the gasoline pipe, causing the smell of gasoline to enter the vehicle through the air conditioning system. If you find a smell of gasoline in the car, you should check and repair the gasoline pipe joints in time.