Suzuki 2005 GSF1200 Service Manual page 170

1G-8 Fuel System:
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).
1. Float
2. Needle valve
1
2
3
"A"
I649G1170008-01
3. Float chamber
"A": Fuel