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I had fuel erupting from my tank at last years Weekender, after filling up at the garage just up the road and then parking in the hot Sun back at the Hotel.
I filled normally as I always do, to the bottom of the rubber neck. So there was air space before I correctly closed the filler cap, I then rode the mile or whatever it was back down the hill. Thinking about it the engine would have still been hot from the run too.
I have to assume that my drain is blocked in the filler cavity, or that it was over awed. But either way it demonstrated that fuel expansion is a real and vivid phenomenon.
I imagine the valve on the SS is a ball valve as Raven describes, but would still have an arrow indicating direction of fitment even though it may not be a full on non-return valve in the normal sense?
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