Fuel leaking when the bike is in the sun

[binarystarr]

I thought perhaps i had a carb problem but i'm pretty sure now it's not as i've not run the bike today at all.


It seems that when the bike is in the sun for any length of time, fuel leaks out the overflow pipe.


I know petrol expands when it's hot but surely it shouldn't leak? Is this a dodgy washer somewhere thats letting petrol out when it shouldn't be?


Anyone else had similar problems on any other bike?