Quote:
Originally Posted by FlatTopFreddie
So which side of the pump is vacuum? (Tank side) Isnt the fuel bowl side pressurized? Air on that side would cause a fuel delivery problem.
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I have always wondered about this! Air or vapor on the suction side would definitely stop fuel delivery. But wouldn’t a bubble of vapor on the pressurized side just get pushed along into the carb where it would escape out the carb’s air vent? Wouldn’t the pump’s check valve keep a vapor bubble from backing up?