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How Carburetors Work

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Regardless of the carb platform, all that have fuel bowls have vent tubes. The pressure differential between the air in the venturi and the ambient air pressure pushing down on the fuel through the vent tubes is what sets fuel flow in motion from the bowls to the boosters. Covering the vent tubes while a motor is running will kill it immediately.
How Carburetors Work - Carbin' It Easy

 Regardless of the carb platform, all that have fuel bowls have vent tubes. The pressure differential between the air in the venturi and the ambient air pressure pushing down on the fuel through the vent tubes is what sets fuel flow in motion from the bowls to the boosters. Covering the vent tubes while a motor is running will kill it immediately.  View Related Article

 

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