GY6 150 fuel leak

[DelMar]

I have a Znen 150TE that started leaking fuel from a fuel line coming off the lower left side of the carb and terminates at a small nipple mounted on the engine near the center kick stand. I can't find what this line does on the GY6 manual but it seems like some sort of over pressure valve. Fuel leaks out when the engine is running and for about 10 minutes after. I've removed the hose and some fuel drains out but it's a finite amount, which is to say it doesn't drain the tank completely. Does anyone know what this hose is?