Excessive crankcase pressure on 19.5 briggs oppy?

That carb has the fuel pump built into the carb. and the diaphragm could have a hole in it drawing fuel into the crank case. Did you change the oil? It could be too thin and getting past the rings and causing it to smoke and use oil. It could also be the crank case breather blowing oil into the carb. through the breather tube.
 
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