Quote:
Originally Posted by Gregg_VA
In the Kawasaki Service Manual for my model (2011), under the appendix for house routing pages 17-28 and 29 it states “Run the carburetor vent hose between the air cleaner box and battery”. That is my reference for it being a vent hose. If it isn’t venting fuel to ground, what is it venting?
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Gregg, like DannoXYZ mentioned it's venting gasoline vapour out. But basically the idea behind it is to equalize the pressure above the gasoline surface in the carburetor bowls with that of the atmosphere to make it constant and not dependent on the pressure of the gasoline vapour. Remember the way the fuel is delivered through the jets is by the pressure differental between the gas surface in the bowls and the vacuum created by the pistons through the intake.
If the was no equalizing hose provided the pressure above the bowls would depend on the temperature of the gas a lot. That would mess up all the tuning of the carb and the richness of the mixture would go up due to temperature increase and down with the temperature decrease. The carb tuning would be all over the place.