You can *carefully* connect an outboard tank to the carb to verify the carb works correctly. If you set the tank up above the engine, once you squeeze the bulb to get it going gravity will probably keep it going. Make SURE to turn off a valve or disconnect when finished.
My engine is too new to have a mechanical fuel pump, so I am not really up on them. Adding an electric pump is one fix if you just can't make the mechanical pump work.
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