72cc 4t carb not getting enough fuel  By  flatroon (Read 216 times)

My scooter has a weird problem. When I take off the fuel hose, the fuel runs like intended, but when I plug it back in the carb, the scooter works fine, but after like 5 minutes the engine slows down dramatically, and I can see the fuel filter getting empty. I removed the auto fuel valve and creating a straight tube, it didn't help at all.
What should I do? The carb is new and I don't want to waste money on a new one, so I'd like to hear opinions on what might cause this and possibly fix the problem. Thanks.