2018 mustang return style fuel system (need help)

[Nathanle5]

I installed a deatschwerks dual pump fuel system, went to pressurize the system and one of the oem lines by the fuel pump started dumping fuel, I’ll attach a picture of what I’m talking about I’m just not sure what I do with it do I plug it or was it supposed to go some where etc if anyone knows please get back to me
Thanks

-nathan

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