A few engine questions

[voucht]

Hello,
The engine has started up, but there are a couple of details I still haven't figured out.

1 – Fan connector.
On the donor (Sierra 2,0i DOHC 1992), the electric fan assembly was connected to the connector shown on the second picture (I tagged the connector when I removed the loom, so I'm sure of that). I haven't the fan assy with me any more, so I can't check, but I checked on the net and I am pretty sure there was only one connector.
However, there is another connector, unmarked on my loom, which seems to has some connexion with the fan. It is shown on the first picture. This connector comes from the thermostat housing, which is beside the air inlet manifold.
Which connector do I need to use to connect my fan*? The electric fan I bought comes with two cable, positive and earth, but also with a relay and the loom to connect it (I guess this has to be used only if the fan has to be connected to an engine with no original electric fan, like the Pinto for example). My engine has one, so I guess there is already a switch and relay in the loom from the donor.
Any idea how to connect my fan and where, for it to start when the water reached a certain temperature*?

FanConnectors.jpg

2 – Yellow relay
On the donor, 2 yellow relays were clipped to the frame of the ECU. You can see them on the 2 first pictures below. I tagged both of them, but I couldn't find the matching connector for one of them on my loom. Is it possible it was connected to a piece of the loom I voluntary left on the donor, like electric windows or something like that*? If you know what these relays are used for, please let me know.

YellowRelay.jpg

3 – Black Box
What is this black box*? I can't figure out what is it utility. As you can see on the picture, there is a rubber hose connected to the 90° fitting of the right compartment of the box. When I removed this part from the donor, I tagged the hose «*connected to a hard pipe coming from the fuel tank*». Not very useful now, as I have no idea where this pipe should be connected. Derivation from the return line*? From the fuel feeding line*? From the vent*? What do you think*?

BlackBox.JPG

All replies or comments, complete or partial, will be much appreciated.

Thanks in advance.