Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 63Get this manual
Fuel System (Carburetor) 2) Draining Fuel
WARNING
Remove fuel tank, fuel hose and carburetor after fully drain the fuel from these partsRemove fuel tank cap and use fuel pump to remove fuelSet fuel cock knob to full open position bPlace piece of rag below the carburetor, and loosen drain screw to drain all fuelRetighten drain screw 3