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Why does it appear to have two lines coming from the fuel tank?

It is a return line, the best I can tell anyway. I am not even sure how the fuel pump part works. It only has a metering diaphragm. Someone on a Facebook group I follow told me that there is a check valve in the fuel Inlet and then there is like a really long duckbill looking thing in the carb flange which I replaced when I kitted the carb. Those two parts are all there is to the fuel pump.
 
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