fuelpump on hijet 1988

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Hi I have a hijet 1988 1.0L petrol.
On the fuel pump there is a smal conection but on my engine it is not conected to anything, and it's also leaking oil.
Is this supposed to be conected anywhere and if it's the case, where?
I apriciate any help i can get on this topic.
Best regards Mathias from Sweden.