I changed fuel pump but now theres gas leaking near gas cap out of black box

What is your question?

So i changed the fuel pump in my lumina and now theres gas leaking out a black box that the hoses from the fuel pump by the gas cap and no its not coming out gas cap. Did i hook it up wrong? Why would it be doing this? When i hooked it up the littlest line coming from front, next to fuel filter line it was too small for the connector from the fuel pump. And one of the lines from the back were too big? Did i reverse them by accident? I need to know asap.