|Don't get Fueled...|
Most built-in fuel tanks have a fuel shut off or anti-siphon valve installed on the fuel tank. It's purpose is to prevent fuel spills in the boat should a fuel leak develop in the fuel system. (other than of the fuel tank itself)
Please note that an anti-siphon valve is not considered a shut off valve. (although it passes CG requirements for recreational power boats)
For additional information concerning CG regulations on fuel line safety see: http://www.uscgboating.org
are situations where both a shut off valve and an anti-siphon valve should be considered.
As example, when routing fuel from multiple fuel tanks to a single engine.
Note that your clear hose goes onto the tank end of
the fitting. The anti-siphon's normal fuel flow direction is what needs to be tested. Too
tight a valve could cause lean operation of the engine and too loose a valve can allow
fuel to escape the fuel tank due to siphoning.
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