The carb must "sense" a good pull of air from the engine to flow gas thru the metering tubes. Your hand closing off the air forces the gas to flow. Your pump is fine, and i really doubt all the gas is evaporating out in 1 week. Besides the carb pulls all the gas from the bottom of the bowl anyway. Causes: worn throttle shaft(really kills the low circuit signal), poor seating intake valve.
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