Fuel pump for motor vehicle

摘要

An open-vane regenerative turbine pump in an electric fuel pump operating submerged in fuel in a fuel tank of a motor vehicle. The regenerative turbine pump includes an open-vane impeller having paddle-like vanes extending radially out from a ring-shaped body of the impeller, an annular groove in a housing of the pump defining a pump channel around the periphery of the impeller and the vanes, a stripper on the pump housing fitting close around the impeller between an inlet port of the pump channel and a discharge port of the pump channel, a pair of radial vapor ports on opposite sides of the impeller at an inside diameter of the annular pump channel, and a pair of steps on opposite sidewalls of the pump channel sweeping downstream from an outside diameter of the pump channel to the inside diameter thereof at downstream sides of corresponding ones of the radial vapor ports. The swept-back steps on the sidewalls of the pump channel gradually reduce the cross sectional area of the pump channel to increase flow velocity in the pump channel ahead of the vapor ports for more thorough scavenging of vapor.