Welcome to 2CarPros.
If you disconnect the fuel line at the carburetor, and are not able to blow pressure into the carburetor chances are the needle is stuck closed. You're not getting fuel into the float bowl.
You need to remove the needle and seat and check it for dirt. It may need replaced also.
Let me know,
Joe
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Thursday, March 14th, 2019 AT 9:31 PM