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If the vent line is plugged, you’ll need a vented cap, as noted by 2Fast4Me, or clean the line, fittings, and the valve on the carburetor. A cracked cap will leak gas, but should not interfere with operation of the motor.
It sounds like your motor is getting too much fuel. An issue with these carbs is the hat shaped fitting that goes on top of the float pin. These are often installed upside down, with the wide part on the bottom, and the small part on top. That is actually upside down. Installing it that way may interfere with the action of the float valve at the bottom of the pin.
Does your carb have the primer on it? If so, the seal is probably shot and may be leaking fuel past it. If you want to rebuild it, instructions are on the site. Modification is best done with a lathe and you’ll need to buy the new seal. Or email me and I can probably help you out.
Tom Manley
manleyt at verizon.net