Were you able to spray WD-40 into the passage that leads from the regulator fuel chamber into the needle valve holes? I'm betting it is clogged up. It is usually a brass insert in the diaphragm chamber of the carb body with a small hole in it. Sometimes there is another small passage too. They let the fuel go from under the diaphragm, into the mixture needle area and then through the carb jets/orifices in the venturi. It is kind of a pain to get the tube on the WD-40 can to fit tight against that little hole in the brass insert, but once you do when you spray you ought to see WD-40 bubbling out through both mixture needle holes. Then as I said, if you blow through the mixture needle holes while looking into the venturi you should see liquid coming out of the various orifices/jets in the carb throat/venturi. Sometimes if the passage I am talking about gets clogged, you can soak the carb in cleaner for a bit and then blow that passage out good with compressed air.

I always use WD-40 for two reasons. One, regular carb cleaner spray will ruin the check valves in Zama carbs instantly, though admittedly I have never had that happen with a Walbro carb. I don't know about the DLE China clone carbs. Also, the WD-40 will kind of bubble/foam in the passages and let you see what's flowing a little better.

AV8TOR