No vent screw, period. Don't know how make-up air gets in, but it does, somehow.
I think the pressure inside the new tank must sometimes be higher than the needle valve (carb float valve) is expected to seal against, because it all works fine in most conditions.
Do most OBs have internal shutoff valves for their external fuel lines? I never noticed that. Easy enough to unclick and pull out the hose connector. Problem is remembering to remove and to replace it. As it happens this OB has a valve to turn off the internal tank, but it does not block the external line in either position. It tees in after the valve.
Sounds like my workaround may be my best option. Glad to know the good reasons for the new tank design.
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