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Sounds to me like you removed the hose that runs from the vacuum source (on the carbs) to the fuel tank valve.
There is a built-in shut-off valve on the fuel tank that requires a negative pressure to open and allow fuel to flow. This negative pressure comes from the carbs. You'll need to reconnect the small hose that ran from the carbs to the fuel tank in order to get everything working.
Cheers,
Owen
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