Reddit reviews Femitu GY6 50cc 150cc Vacuum Fuel Pump Petcock Roketa Sunl TAOTAO Chinese ATV Scooter by Femitu

Have you checked to see if there is fuel getting to the carb? There probably is a vacuum fuel valve between the fuel filter and the carb, bolted to the frame. If the hose is cracked or torn, or the valve is bad, the carb won't get enough, or any, fuel. Try bypassing it and try starting it then.

I had this exact issue, though mine would start and idle just fine, but die after about a minute on throttle. Got a new carb, same issue. Found I had a torn vacuum hose at that fuel valve. I replaced the hose, and it ran just fine. For a little while. It would die after a few more minutes. I bypassed the valve, and it ran properly all day. So I checked the valve by sucking on the vac hose and seeing how much fuel was flowing out of the fuel line to the carb, and found it was just a trickle.

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A replacement is about 6 dollars, and at least is an easy thing to check before you order.

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https://www.amazon.com/gp/product/B00E7AKKCM/

I would check the fuel petcock and the vacuum line that goes to it. The TaoTao I just bought used, had a similar issue and there was a vacuum leak in the line that goes from the intake to the petcock. Also, check that vacuum line for fuel as that is a sign that the diaphragm in the petcock has failed.

The fuel filter had never been replaced and I could see visible dirt in it. I'll just get a new one and clamps (something like this https://www.amazon.com/Wings-Inner-Colorful-Motorcycle-Performance/dp/B012MBE460/ seems right?)
For the vacuuum petcock something like https://www.amazon.com/VACUUM-PETCOCK-ROKETA-CHINESE-SCOOTER/dp/B00E7AKKCM would be good? I didn't see anything to suggest it was broken but if it is known to break and cheap to replace may as well do it and have a more reliable bike.