| 摘要 |
A main fuel tank in an automotive vehicle contains a reservoir in which is located a two-stage electrically operated pump. The first stage is a jet pump which draws fuel from the main tank and delivers it to the reservoir. The second stage is a rotary pump which draws from the reservoir and delivers to the vehicle engine. The reservoir has overflow restriction means which allows air to vent while the reservoir is filling but which restricts fuel flow when the reservoir is full. This creates pressure in the reservoir to create back pressure against and shut down flow from the jet pump and also increase pressure on the fuel inlet of the main pump thus increasing the efficiency of the main fuel pump.
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