Honda BF75 BF100 Outboards Service Manual, Page 96Get this manual
HONDA BF75BFIOO
Float chamber
Fuel from the fuel pump flows past the valve seat 1201 and float valve 1211 into the float chamberThe float 1221 then moves up and pushes the float valve onto the seat with tl1e float arm (23)This shuts off the fuel inlet clearance between the valve and valve seatNew fuel can not flow into the carburetor float chamberIf the fuel level is lowered, the float moves downallowing the valve to move away from the valve seatIn this way constant fuel level is maintained in the float