What are the reasons for the loud engine noise after refueling at a small gas station?

[McLilah]

The reasons for the loud engine noise after refueling at a small gas station may include overfilling the fuel tank, engine overheating leading to loss of power, etc. Overfilling the fuel tank: After overfilling, the instantaneous working resistance of the engine increases, which raises the crankshaft's rotational resistance, reduces the engine's output power, and allows excess fuel to enter the combustion chamber and participate in combustion. The result is oil burning, blue smoke emission, and increased fuel consumption. Engine overheating: Engine overheating leads to a loss of power. When the engine operates for an extended period, its surface becomes excessively hot, and the cooling system fails. In this case, the first step is to check the cooling system. If there is a problem with the cooling system, it may cause exhaust blockage because the vacuum tube is likely to break. At this point, steam or hot air will escape from the engine, producing some loud noises.