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With the baffle in place you can not see the water level which would be just at or below it, when it finds it own level. If you over fill it will puke out till that level is reached. If you are not over filling, could be as you have suggested re the water pump or over heating could be; GVA or were you are setting the spark lever. Puking water out might not even be over heating, you would need to know what temperature it is really running at.