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hi, this can happen if you have removed the two orange flap valves in the cap (it's what they are there to prevent) of course it's an either or situation leave them in and risk venting/vacuum in the tank issues or remove them and risk leaking at the cap issues, I have the same issue as you. solution is to not fill the tank so full on hot days just leave a decent air gap below the cap.
PS. it will also do this if the bike is laid down fuel leaks from the filler cap.
 
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the only way to find out is look, they could have been removed by a PO of the tank, or the flaps have become hard and no longer work. either way it's not a problem I always leave a 2in (50mm) air gap above the fuel when filling the tank, it doesn't reduce the total mileage on a tank full by very much (and there is always) a fuel station somewhere on route to put some more in if required on a long run.
 
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