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: 

Also, there 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.

The most common problem with an anti-siphon valve is that they can clog with debris, sucked from the fuel tank. If you suspect  a fuel restriction, always check the anti-siphon valve for items stuck in the valve and run the test below.


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anti-siph1.jpg (9001 bytes)

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.
Never try to adjust a faulty anti-siphon valve, toss it and get a new one.


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