Could be any number of causes.Wrong adj.malfunctioning float or float valve,
improperly assembled carb,Could be a leaking float pull it out a shake it.
It is normal for a small amount of fuel to pass through the motor and out the exhaust.Very noticeable in a barrel.
MMMMMM I purchased a float yesterday, for Tecumsh motor, carb, at local lawn mower shop, will install today, makes since if absorbing fuel...what is correct fuel mixture,,,50:1 or ?????
Also, what year is it?