Unfortunately, the Tohatsu/Nissan/Mercury/? 3.5 4 stroke
has an integral tank and no room under the hood
for a water
separating filter. The good news is that the translucent tank will reveal water
in the low points in a good light. Pull the line from the tank and drain the water. Drop the bowl and spray some carb cleaner into the inlet line and blow it through. Eventually the clot will dissolve around the jet. Then from now on shut the engine
down by turning the fuel
off, and wait for it to stop.
Cupping your hand over the intake while pulling the starting rope
will occasionally pull enough vacuum to clear the snot around the jet.