The connector is there so you can separate the recoil side of the case with the fuel tank inside it without having to pull the fuel line out of the tank. You can just use one piece or you'll need to remove the gas tank from the side cover if you want to remove the recoil.
And, you want that connector to end up right at the notch in the housing. Slide it one way or the other so that the fuel tank end is clamped.
Right Mark?