Our 2010 Prius started leaking gas more and more during our vacation, every time I filled fuel. It got so bad that at one petrol station an angry guy was shouting at me that I have a leak and need to fix it (as if I wouldn't have noticed the gasoline puddle surrounding my feet).
So today I discovered that the filler and breather pilpe are just crumbled remainings of themselves and that both need to be replaced.
I'll order them during the weekend and helped myself in the meantime by sealing the pipes with good old gaffa tape and metal-epoxy. Not pretty but works for now.
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diy