There are several versions of the reasons for the emergence of a hisse-like sound under the bottom of KIA Rio III. In one version, this is a spike adsorber-it is filled with activated carbon and one end is connected to the intake manifold, and the other end is connected to the top of the petrol tank-the one where is usually not the petrol, but the vapor. The purpose of the adsorber is to keep the air from the air, so as not to poison it with petrol vapor.
According to another version, this hissing is just the sound of the operation of the electric pump. According to experts, the chissing under the bottom of the Kia Rio is one of the features of this car and is not a cause for concern.
