| 摘要 |
<p>A fuel tank cap for use in a motor vehicle including a cap body having a path communicating the interior of a fuel tank with the atmosphere and having incorporated therein a sensor valve unit. The sensor valve unit includes a valve housing having an upper wall with a first through-opening therein open to the path for communication with the atmosphere, a peripheral wall with a second through-opening at a predetermined position which is open to the housing interior and communicates with the fuel tank interior, an upright funnel shaped bottom wall, a weight ball movably positioned on the bottom wall, and a valve body resting on the weight ball so as to be moved upwards for closing the first through-opening when the weight ball rolls over the bottom wall and thereby carries out an upward movement.</p> |
