(57) A carburettor 8 especially useful for an outboard motor 2, where there is a risk
of water ingress and fuel contamination, has the conventional drain plug on lower
drain port 9 replaced by tubing 10 with a closure knob 11, below the carburettor.
The length of closed tubing fills with fuel as the engine operates. If water enters
the carburettor intake 8a, opening of closure 11 drains this accumulated fuel, and
the carburettor chamber, under gravity; drainage is improved if the outlet end 13
of the tubing is lower still.
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