TOHATSU 2.5 Owner's Manual page 20

@Make sure that the shift lever is in the "NEUTRAL" position. (3 581 only)
@Turn the fuel cock lever to the "OPEN" position.
Note:
If fuel is not supplied immediately to the carburetor (new engine or
after cleaning), wait for about 15 seconds for the proper quantity of
fuel to flow into the carburetor after opening the fuel cock.
@Set the choke lever to the "CLOSE" position