The fuel tank has a filler (1), to which a filling hose or filling tube is lockably connected, and on which a lid (2) is pivotably mounted, which closes the outlet cross section of the filler under the action of a spring element (3) and which is pivoted in an open position against the spring force by a fuel flow guided in the filler. The spring element is made from plastic and is formed either on the lid made from plastic or on the filler made from plastic.
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