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Hi NormanB,
That is rational. Verify the actual pump pulse vacuum line is not loose, cracked or split.
The extra fuel means more weight in the tank so the fuel will feed easier to the carburetor. When the fuel gets low, the pump has to work harder. If the vacuum pulse line is cracked or the pump is bad, the pump will not work efficiently.
These pumps are a simple crankcase diaphragm pulse pump on most models.
That is rational. Verify the actual pump pulse vacuum line is not loose, cracked or split.
The extra fuel means more weight in the tank so the fuel will feed easier to the carburetor. When the fuel gets low, the pump has to work harder. If the vacuum pulse line is cracked or the pump is bad, the pump will not work efficiently.
These pumps are a simple crankcase diaphragm pulse pump on most models.