Honda Outboards BF40A/BF50A Service Manual, Page 82Get this manual
HONDABF35A45A
FUEL TANK (MODEL WITH FUEL TANK)
aDISASSEMBLYREASSEMBLY
Before disassemblydrain the fuel tank and fuel line completelyGasoline is extremely flammable and is explosive under certain conditionsDo not smoke or allow flames or sparks in the area[1)
TO ENGINE
[13) PRIMER VALVE
INLET VALVE
REASSEMBLY: Check for cracks and deteriorationReplace if necessary
[11) FUEL TANK
[6] TUBE CUP BAND 20mm (2)