Tohatsu 4 Stroke MFS 2/2.5/3.5A Outboards Service Manual, Page 158Get this manual
Trouble 2
Engine starts but stalls soon
Inspection of Fuel System, Ignition System, Compression Pressure
Fuel System
Check air vent screw of fuel tank
Open air vent screw
Check if fuel contains water and fuel filter is clogged
Does fuel contains water, or is fuel filter clogged?