Vented fuel module reservoir with two-stage pump

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 rotary side lateral pump which draws fuel from the main tank and delivers it to the reservoir. The second stage is a rotary turbine pump which draws fuel from the reservoir and delivers it to the vehicle engine. The reservoir has overflow restriction means which allows air to vent while the reservoir is filling with fuel but which restricts fuel flow when the reservoir is full. This creates pressure in the reservoir to create back pressure against and shut down fuel flow from the first stage pump and also increase pressure on the fuel inlet of the second stage pump thus increasing the efficiency of the second stage fuel pump.