Why is there a strong gasoline smell after starting the car?

[JustinAnn]

A strong gasoline smell after starting the car is caused by incomplete combustion of gasoline. When the car starts while cold, the vehicle's computer will appropriately increase the fuel injection volume based on intake air temperature and coolant temperature signals. At this time, the engine has not yet reached its normal operating temperature, resulting in poor combustion efficiency. This causes some fuel to be discharged without being fully burned, hence the strong gasoline smell during cold starts. This phenomenon is particularly common in winter. The normal operating temperature of an engine is between 80 to 90 degrees Celsius. When the engine reaches this temperature, the vehicle's computer will correspondingly reduce the fuel injection volume. Additionally, at the engine's normal operating temperature, the fuel will be fully burned, and the gasoline smell will disappear.

[IsabellaAnn]

I remember encountering a similar issue when driving an older car before. The strong smell of gasoline after ignition was truly alarming. Typically, this indicates a potential leak in the fuel system—such as a loose or improperly sealed fuel tank cap, or aging fuel supply lines with cracks that allow fuel to leak and produce the odor. It could also be due to abnormal exhaust where unburned gasoline results in smelly emissions. If it's more noticeable during cold starts, it’s often weather-related, as fuel molecules tend to condense and evaporate more slowly. I recommend immediately turning off the engine and ventilating the area. Avoid driving or smoking to prevent fire hazards. Then, pop the hood and check for any fuel stains to identify the source. Developing regular maintenance habits—like replacing seals annually and inspecting fuel lines—can prevent such issues. Safety first—don’t delay until minor problems escalate, affecting the entire engine and costing more to repair.

[VonHazel]

Experiencing a strong gasoline smell after starting the car is quite common, I must say. There could be several reasons for this: First, there might be an issue with the fuel supply line, such as loose connections or aging/cracked hoses, causing fuel to leak and spread the smell during ignition. Second, the fuel injectors could be stuck, leading to excessive unburned fuel being released through the exhaust. Third, the charcoal canister might have failed, allowing fuel vapors that should have been recycled to escape. You can do a quick check yourself—after the car has cooled down, take a look under the chassis or engine compartment for any wet oil stains. Don’t ignore this warning sign, as worsening leaks could damage parts or even cause a fire, posing significant risks. It’s best to drive to a repair shop the next day—they can quickly locate the issue with diagnostic tools. Remember, regular maintenance like checking fuel lines and replacing the fuel cap can save you a lot of trouble.

[LaMia]

A strong gasoline smell when starting the car is indeed a cause for concern. I believe the focus should be on potential sources of leaks, such as poor sealing in the fuel system or exhaust faults causing unburned gases to escape. Once you smell it, immediately turn off the engine and open the windows, and avoid further operation to prevent accidents. Check if the fuel tank cap is properly closed or if there are any oil drips on the ground. If there are significant temperature changes, gasoline molecules may become more noticeable. It is recommended to record the frequency of occurrence, and if it happens often, seek professional inspection promptly. For safety, pay attention to changes in smell daily, as it is often the first signal of hidden problems.