Why do you smell gasoline when you start your vehicle?

The different smells produced when the vehicle is running are also manifestations of vehicle failure and need to be treated with caution. The two most common and serious smells are burning smell and gasoline smell.

Today we are mainly talking about gasoline smell. Maybe you have encountered a situation where you smell a strong gasoline smell outside the vehicle after starting the car in winter. What is going on? Is the vehicle leaking oil?

If you can only smell gasoline when you cold start the vehicle in the morning, but not at other times, and the smell does not last long, this is most likely a normal phenomenon caused by incomplete combustion.

Because during cold start, the engine computer knows through the water temperature sensor that the current temperature is very low. If you want to start normally and burn stably without stalling after starting, you need to spray more gasoline to make the mixture richer. Therefore, the engine computer will control the injection of more gasoline to enrich the mixture, and at the same time increase the idle speed to keep the engine running normally.

Since the mixture is enriched, that is, there is more gasoline and less air, part of the gasoline is not atomized, which will inevitably lead to incomplete combustion. Some of the unburned gasoline is discharged out of the car, and you will smell the gasoline. As the water temperature rises, the idle speed gradually decreases, the amount of fuel injection will gradually decrease, and eventually return to normal, and the gasoline smell will disappear.

If the gasoline smell is very strong and does not go away for a long time, there may be certain problems with the vehicle. The most common problem is carbon deposits that lead to very incomplete combustion.

If the air filter and gasoline filter are not properly maintained and have not been replaced for a long time, resulting in insufficient air intake and insufficient fuel injection, this phenomenon will also occur. These two situations are usually accompanied by unstable engine idle speed and shaking. If this fault phenomenon occurs, it means that the carbon deposits are already serious.

If you can smell gasoline when standing behind the vehicle regardless of whether the car is cold or hot, and you can also smell it in the cab while driving, there may be a gasoline leak and you must check it promptly.

When the seal of the vehicle's gasoline pump is aged, or the gasoline pump outlet pipe is aged and cracked, a small amount of gasoline will leak out. The gasoline pump is located at the bottom of the rear seat, and the gasoline can directly enter the interior of the car after evaporation, so you will always smell the gasoline.

If your vehicle smells gasoline after being filled with gas, or after running under heavy load, you should suspect an oil leak and need to check before continuing to drive, otherwise the risk is high.