Fuel enrichment simple starting device and method of carburetor

A fuel enrichment simple starting device, for a carburetor for use with an engine having a fuel tank, the carburetor comprising:

• a fuel pump having a fuel pump chamber, a fuel enrichment chamber, and a reciprocating pump diaphragm between said fuel pump chamber and said fuel enrichment chamber;
• a metering chamber adapted to receive fuel from the fuel tank;
• a fuel inlet passage adapted to carry fuel from the metering chamber to the fuel enrichment chamber;
• a choke for adjusting air flow from an air intake to the throttle bore;
• and a purge bulb having a bulb interior space with a bottom wall, and a bulb check valve in the bottom wall and having an outer perimeter, the bulb interior space being fluidly connected to a fuel purge passage comprising a bulb inlet passage for receiving fuel into the bulb interior space and an bulb outlet passage for expelling fuel in the bulb interior space to the fuel tank, wherein the bulb check valve is adapted to close the bulb inlet passage and open the bulb outlet passage and when the bulb is squeezed, and adapted to close the bulb outlet passage and open the bulb inlet passage when the bulb is released;
• the improvement comprising:
• the fuel enrichment simple starting device comprising a fuel enrichment starting passage extending from the fuel enrichment chamber to the throttle bore, and a prime force transmission passage extending from the bulb interior space to the fuel pump chamber, wherein the prime force transmission passage has a first end fluidly connected to the bulb interior space by a hole in said bottom wall and having a second end that opens into the fuel pump chamber, said hole in the bottom wall being distanced from the bulb check valve so that the hole is outside of said outer perimeter, so that, when the bulb is squeezed, a portion of the fuel in the bulb interior space flows through said hole into the fuel pump chamber to drive the diaphragm toward the fuel enrichment chamber, so that fuel in the fuel enrichment chamber is forced through the fuel enrichment starting passage into the throttle bore, whereby the throttle bore is pre-injected with fuel to increase fuel-to-air ratio before starting the engine.