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What is the plastic box near the petrol cap

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Hi anybody
I'm tracing a smell of petrol that seems to be coming from the wheel arch by the petrol cap.

In removing the wheel arch cover i noticed a small plastic container (6"x3"x4" approx) up near the petrol cap. It seems to have some type of cap on top of it & there are 2 pipes that go into it.
Can anyone tell me what that is for?

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