Anti overflow valve in fuel vent line?

SJN

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May 30, 2021
32
Catalina C310 Seattle
Hello! Our boat C 310 hull 260has a while object spliced into the fuel tank vent line about six inches below the transom vent . What is it? Is it a vent anti overflow valve? The object is small, about an inch long of hose space and tees out from the line an inch on either side. Sorry, no pic to show you.
 
Feb 26, 2009
716
Oday 30 Anchor Yacht Club, Bristol PA
Fuel tank whistles are very common... Most of us have heard the sound when the tank truck was filling the neighbour's s tank.
 
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