Originally Posted by tinped
Thanks for the heads up on those tanks. Do you think that it would possibly be that manufacturer(cheaply made), or design issue?
I think the manufacturers are being forced into a fool's errand. Auto manufacturers have gone from using charcoal canisters to sophisticated vapor recovery systems to meet similar mandates, to expect a check valve to accomplish the same thing is na´ve. These tanks are intended for use above deck for a reason, there is no easy way to ensure vapors will not escape. So while they fail to accomplish this goal, they now introduce pressurized fuel lines on pretty much every hot day. Previously the lines where at atmospheric pressure when the engine isn't running or under a suction when it is running. If the supply hose is under pressure, you will be leaking gasoline into the environment anytime any connection isn't just right (O-rings get nicks, salt deposits disturb mating surfaces, connectors get stressed) or any slight failure of your carburetor's float valve(s) will overflow the carb with gas and leak into the water. Yes you could disconnect it every time you shut the engine off but what have we actually accomplished? It just seems contradictory to the EPA's intent.