Thats actually the fuel feed line going from the filter (pictured) up to the fuel rail. It usually goes through the fuel pulsation damper, but as you have a braided line i'm assuming this has been removed.
That being the case you need to check higher up on that line as it passes close to so many items that the leak could be higher up on the engine and the oil travelling down the line. The line will most be connected to the end of the fuel rail by the firewall (assuming the fuel pulsation damper has been removed)
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