2008 Suzuki LT-A400/F, LT-F400/F ATV Service Manual, Page 176Get this manual
1G-9 Fuel System: Float System The float (1) and needle valve (2) work in conjunction with one anotherAs the float (1) moves up and down, so does the needle valve (2)When there is high fuel level in the float chamber (3), the float (1) rises and the needle valve (2) pushes up against the valve seatWhen 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) 3 "A"