US coast guard requires boat builders to install an AS vavle or an accesable valve that can be closed comming off the pick up in case of fire/fuel hose leak. i run a straight barb. but if you still want to be able to close off your fuel supply you can install a valve that screws into the fuel pick up. if the straight barb doesnt fix it, you might want to pull your fuel pick up out the tank.
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