How much fuel is draining out? Just a few drops or much more? You might have a problem with your float/float valve. Is your overflow tube routed up or clogged? This combination makes all the excess fuel from a bad seal on float to pour right down the crank case. Kicking it over with lots of fuel in there blows your crank seals. I had this problem on an old Husqvarna, where small grit in the fuel tank slipped by the fuel screens and jammed the float needle open, with a massive fuel overflow as the result. And it blew out my crank seal.
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