| 摘要 |
A fuel tank has a pouring bowl on top of it for receiving a liquid being discharged from a supply container. The bottom of the bowl has an outlet that opens into the tank, with a spout extending from the outlet down into the tank. A vent tube extends from inside the tank upwardly above it, and the bowl has a signal opening in its bottom communicating with the inside of the tank above the lower end of the tube, which is higher in the tank than the lower end of the spout. When the liquid level in the tank rises around the spout high enough during filling to close the lower end of the vent tube, air in the tank will start to escape through the signal opening and produce a string of bubbles in the liquid remaining in the bowl to signal that no more liquid should be poured into the bowl.
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