What Causes the Buzzing Sound Near the Fuel Tank After the Car is Turned Off?
2 Answers
Car fuel tank buzzing sound after turning off the engine is the sound of the fuel pump working, which is a normal phenomenon. Below is relevant information about the car fuel tank: 1. Introduction: The car fuel tank, also known as the automobile fuel tank, is a container that stores fuel for the car. It is the only place in the car where fuel is stored and is the power source for the engine. 2. Fuel tank capacity measurement unit: The international standard uses L (liters) as the measurement unit for car fuel tank capacity. Different countries also have corresponding standards for car fuel tank capacity. In China, the car fuel tank capacity is regulated to be 95% of the rated value, but in practice, the actual capacity is generally larger than the nominal capacity.
I drive quite often and have encountered the humming sound from the fuel tank area several times after turning off the engine. Generally, this isn't a big issue—it's mostly the car's fuel vapor recovery system in operation. After shutting down, the system automatically releases excess vapor to prevent excessive pressure in the fuel tank, which sounds like a humming noise. My own car does this, and it's more noticeable in winter or hot weather, but it doesn't last long. If the sound is too loud or doesn't stop, it might indicate a clogged charcoal canister or a faulty valve, requiring a visit to the repair shop. Additionally, a loose fuel cap can also cause air leakage and unusual noises, so I always check the cap after refueling to avoid such minor issues. Car maintenance shouldn't be taken lightly—safety comes first. Over time, these small habits can save a lot of hassle.
