Harsh carb cleaners or soaking longer than 15 minutes can "swell" the check valves in the cube (in the Idle circuit and the Main nozzle) and once they fail, the carb will not operate correctly. The prime symptom is that the primer bulb won't draw fuel. Use mild brake cleaner or WD 40 ONLY to clean these little jewels. They CANNOT take prolonged exposure to very harsh chemical cleaners.
You may have accidently hooked the fuel lines up wrong. Check this sketch and see if it helps.
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