Fuel pump having regenerative section provided with vent housing for voltex flow

A fuel pump comprising a regenerative pump section, a driving section connected to an impeller of the regenerative pump section, and a housing enclosing the regenerative pump section and the driving section, the fuel pump being provided with a vapor vent midway of a pump passage extending from a suction port of the regenerative pump section to a discharge port thereof, wherein

• the regenerative pump section is provided with a control hole communicating with the pump passage and disposed at a downstream side of the vapor vent,
• the vapor vent and the control hole communicate with an outside of the fuel pump through a vent housing, and
• the vent housing has a vent chamber of a substantially circular shape, a tangential groove provided with one end communicating with the vent chamber in a tangential direction to the vent chamber and other end communicating with the control hole, a vent groove provided with one end communicating with the vent chamber in a radial direction to the vent chamber and the other end communicating with the vapor vent, and a discharge hole provided with one end communicating with a center portion of the vent chamber and other end communicating with the outside of the fuel pump.