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How long does it run?
Once started, if you loosen the fuel cap, you should get a vacuum or whoosh sound. If not then the system isn't pressurizing.
The system uses crankcase pressure to pressurize the tank. This forces the fuel to the carb. Any leak in the system, at the tank, fuel connector etc will cause fuel to not transfer.
Let me know how long it runs and your results from running it.