Re: DuroMax 440 smokes and breaks up
A hole in the crankcase is not a good way to power a fuel pump on a clone. You have to remember this engine is splash oiled and the oil is everywhere in the crankcase. The usual method for the pump is either a carb spacer or a fitting in the valve cover. My suggestion would be to plug the crankcase tap and use one of the more traditional methods and see where you are.
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