Fuel tank structure

A fuel tank structure comprising:

• a fuel tank that can accommodate fuel at an interior;
• a canister that, by an adsorbent, adsorbs evaporated fuel within the fuel tank, and that releases, to the atmosphere, vapor after adsorption of evaporated fuel;
• a full tank regulating valve that is provided within the fuel tank, and that becomes a closed state due to a float floating in fuel when a fuel liquid surface within the fuel tank reaches a full tank liquid level that is set in advance;
• a communication pipe that communicates the fuel tank and the canister via the full tank regulating valve, and at which is provided a sealing valve that can be opened and closed by control;
• a cross-sectional area varying valve that, when tank internal pressure that is applied from inside of the fuel tank increases, reduces a cross-sectional area of a flow path of vapor that flows toward the float;
• and
• a suppressing member that is positioned between the cross-sectional area varying valve and the float, and that suppresses airflow from the cross-sectional area varying valve from directly abutting the float.