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Yamaha 70hp precision blend fuel question

I have a Yamaha 70hp precision blend model. I have redone the fuel line as it looked dodgy. The previous owner had a T piece on the fuel line before the filter that would send a very small line to the other side of the engine, just next to the carbys, into this small metal tube that went into the block. Any idea what this could be as I couldn't see it in any of the Diagrams?
Thanks
 
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