Where does the small hole next to the fuel tank cap lead to?

[AngelinaFitz]

The small hole next to the fuel tank cap leads to the interior of the fuel tank to balance the internal air pressure. Here are the relevant explanations: 1. Function: A completely sealed fuel tank would create a vacuum as the fuel level gradually decreases, leading to insufficient fuel supply or failure to supply fuel normally. The evaporation of high-temperature fuel would increase the internal pressure of the tank, causing excessive fuel supply or directly forcing fuel into the crankshaft case. Therefore, a small vent hole is often provided on the fuel tank cap to balance the internal and external air pressure. 2. Consequences of blockage: If the small hole is blocked, it will result in insufficient exhaust of the fuel tank, making it difficult to fill the tank completely when refueling. In severe cases, it may even lead to fuel leakage from the tank.