FUEL AND CARBURETOR
6-6
FLOAT SYSTEM
The float system is designed to maintain a constant height of
gasoline during operation. When the fuel flowing from the fuel
pump into the float chamber through the needle valve reaches
the constant fuel level, the floats rise. When the buoyancy of
the float and the fuel pressure of the fuel pump balance, the
needle valve seals the orifice in the needle seat, preventing
further fuel delivery, and the level of fuel in the bowl remains
relatively constant.
The fuel level in the bowl assists in controlling the amount of
fuel in the fuel mixture. Too high a level allows more fuel than
necessary to leave the nozzle, enriching the mixture. Too low a
level results in a leaner mixture, since not enough fuel leaves
the nozzle. Therefore, the
predetermined fuel level should not
be changed arbitrarily.
FLOAT INSPECTION
1. Inspect float and float tang, replace it if is broken or
cracked.
2. Inspect the needle valve tapered surface for any sign of wear
or damage. Be sure the spring-loaded pin is free moving
returns freely when pushed. The needle valve and seat
be pressure tested after assembly.
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