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With years of experience in designing and assembling complete sets of generator sets

What is the function of the small air hole on the fuel tank cover of a diesel generator set?

Time:2023-06-03

What is the function of the small air hole on the fuel tank cover of a diesel generator? I believe many customers of generator sets will notice that there is a small air hole left on the fuel tank cover of the generator set. Why is this? Leave a small hole in the fuel tank, which not only makes it easy for air, moisture, and dust to enter, but also makes it easy for fuel to evaporate and spill out. Why do we have to leave such a small pore? These pores are directly related to the normal use of the generator set and also have a significant impact on the performance of the generator set. The scientific principles behind this are explained to everyone:

1. In order to prevent the fuel in the fuel tank from splashing out due to oscillation, as well as the overflow of oil vapor and the entry of external dust, the fuel tank should be covered and sealed. But when the fuel level drops due to consumption, a certain degree of vacuum will form inside the fuel tank, causing the oil pump to lose its ability to absorb oil.

2. When the temperature is very high, fuel will evaporate, and the oil vapor will make the pressure inside the fuel tank too high. Both of these situations require automatic communication with the atmosphere when there is a pressure difference inside and outside the fuel tank. So there should be ventilation holes on the fuel tank cover to balance the air pressure inside and outside the tank.

3. When using, it is important to ensure that the ventilation holes on the fuel tank cover are smooth. If the vent hole is blocked or the fuel tank cap is lost and the fuel tank opening is tied with plastic cloth, negative pressure will be formed inside the fuel tank due to the decrease in fuel level during the operation of the generator set. This will result in unstable operation of the generator set, decreased power, automatic shutdown, and difficulty in starting the hot engine.

From the above introduction, I believe everyone already knows that although the air hole is a very small design, it plays a very important role. Therefore, when using a generator set, it is important to regularly pay attention to the condition of the air hole and whether it is blocked to ensure the efficiency of the generator set.


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