Patent ID: 7568472

Claim:
A fuel pump of a fuel system including a fuel tank and a carburetor adapted for use with an internal combustion engine, comprising: a carburetor having a mixing passage, a fuel bowl, a fuel nozzle communicating the mixing passage with the fuel bowl to supply fuel from the fuel bowl to the mixing passage when the engine is operating, and a float in the fuel bowl responsive to the level of liquid fuel in the fuel bowl to open and close a valve to supply fuel from the fuel tank to the fuel bowl; and an accumulator pump comprising a diaphragm disposed within an interior of the fuel pump to divide the interior into a fuel reservoir on a reservoir side of the diaphragm and an oppositely disposed actuation chamber on an actuation side of the diaphragm; a biasing member to yieldably bias the diaphragm; a fuel inlet to the fuel reservoir and communicating with the fuel bowl; an inlet check valve in communication with the fuel inlet; a fuel outlet from the fuel reservoir and communicating with at least one of the fuel tank or fuel bowl; an outlet check valve in communication with the fuel outlet; and the biasing member moving the diaphragm to withdraw liquid fuel from the fuel bowl and into the fuel reservoir substantially during shutdown of the internal combustion engine.