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Fuel feed system for carburetors on motorcycles

  • US 4,385,676 A
  • Filed: 04/14/1981
  • Issued: 05/31/1983
  • Est. Priority Date: 04/22/1980
  • Status: Expired due to Fees
First Claim
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1. A fuel feed system for carburetors on motorcycles, comprising a frame on which an engine having a carburetor is mounted;

  • a main fuel tank provided at a front side of an upper portion of said frame for storing alcoholic fuel to be used as a main fuel;

    an auxiliary fuel tank provided at a rear side of the upper portion of said frame for storing gasoline to be used as a starting fuel;

    a main fuel passage for connection between said main fuel tank and said carburetor, an auxiliary fuel passage for connection between said auxiliary fuel tank and said carburetor;

    a switch cock disposed in said main fuel passage and adapted to be manually operated to control supply of alcoholic fuel to said carburetor; and

    a measuring pump disposed in said auxiliary fuel passage and adapted to be manually operated to meter and supply a proper amount of gasoline from said auxiliary fuel tank to said carburetor at the time of engine starting, said switch cock and said measuring pump being disposed on opposite sides of a lower surface of said main fuel tank, said pump comprising a pump body, a diaphragm of an elastic material dividing the interior of said pump body into a pump chamber communicating with said auxiliary fuel passage, and an atmospheric pressure chamber communicating with the atmosphere, and a return spring resiliently biasing said diaphragm toward said pump chamber.

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