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yes, it is actually a vacuum break.
As the engine cools with the bail holding it up the tank can go to atmospheric pressure. That encourages trapped air to migrate to the tank and then out. With no bail engagement the shaft just rides up and down depending on pressure/vacuum in the tank.
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
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