FUEL SYSTEM 4-13
FUEL
AIR
FUEL/AIR MIXTURE
FUEL
STARTER (ENRICHER) SYSTEM
Pulling the starter (enricher) plunger causes fuel to be drawn into the starter circuit from the float chamber 1.
The starter jet 2 meters this fuel. The fuel then flows into the fuel pipe 3 and mixes with the air coming from
the float chamber 1. The mixture, rich in fuel, reaches the starter plunger 4 and mixes again with the air
coming through a passage extending from behind the diaphragm.
The two successive mixtures of the fuel with the air provide the proper air/fuel mixture for starting.
This occurs when the mixture is sprayed through the starter outlet port 5 into the main bore.
NOTE:
A starter (enricher) system is operated almost the same way as a choke.
FLOAT SYSTEM
The float 1 and needle valve 2 work in conjunction with one
another. As the float 1 moves up and down, so does the needle
valve 2.
When there is a high fuel level in the float chamber 3, the float 1
rises and the needle valve 2 pushes up against the valve seat.
When this occurs, no fuel enters the float chamber 3.
As the fuel level falls, the float 1 lowers and the needle valve 2
unseats itself; admitting fuel into the float chamber 3.
In this manner, the needle valve 2 admits and shuts off fuel to
maintain the appropriate fuel level inside the float chamber 3.
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