No worries, Shiny.
The only suction in the pump is when the pump diaphragm moves upward (caused by the fuel pump cam on the end of the camshaft and the the pump lever) and opens the check valve(s) to allow fuel into the pump cavity and then to the carb fuel line.
When the fuel pump cam moved the opposite way, the process starts again. Normal pumps have one inlet valve and one outlet valve.
Tom V.
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"Engineers do stuff for reasons" Tom Vaught
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