| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a vent valve structure preventing deformation of a fuel tank due to negative pressure without separately providing a relief valve under a condition of over-fuel, parking on a slope or traveling, and negative pressure in the fuel tank, and reducing height thereof. SOLUTION: In the vent valve structure having a cut valve cutting off vent of fuel vapor and flow out of liquid fuel, a positive pressure regulating valve released when positive pressure acts thereon, and a negative pressure regulating valve released when negative pressure acts thereon built in as a unit, the negative pressure regulating valve is provided in a position bypassing a valve opening of the cut valve and communicating a vent passage and the fuel tank in parallel.</p> |
