Frank – I’m pretty sure the gas valve O-ring was not seated correctly (not pushed all the way in), resulting in the valve end (the pin) not sticking out far enough. When I connect the fuel line, it does not push against that valve/pin enough to lift the other end (held down by the spring) off the O-ring, allowing gas to flow. Does that make sense? In any event, I’ve ordered a couple core plugs and will revisit that O-ring as soon as they come in.