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Old 09-08-2016, 11:20 AM   #55
Gdavid
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City: Owings, Md
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Quote:
Originally Posted by WesK View Post
We are only supposed to fill it to a line. One gallon in a one gallon tank. That leaves an expansion space that should take care of heating. I suspect many folks (I often do) fill it as full as we can and that leaves no expansion space.
In my case, the gas was not overfilled, it was above the fill line because the tank wasn't level. My point is, the EPA cap is supposed to prevent vapors from escaping, but if that joint is susceptible to liquid leaking through it, it will certainly allow vapor to pass through when pressurized to the same degree, thus making the vapor proof cap useless. You would actually experience greater expansion with a nearly empty tank than one filled to the max fill line, as the vapor will expand at a greater rate than the fluid.
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