[ossiblue]

I just did this last night, but my memory is still not exact. First, pop out the black plug where your #1&2 are located, and find which fitting is attached to the tube that reaches to the bottom of the tank. That fitting should attatch to nipple ZZ.
Tube C should connect to nipple YY.
Connector D should plug into the black stopper as the return line nipple.
Tube B should plug into connector D.
I am assuming tube A leads to the nozzles.

Plug in the ground connector (brown) only in it's proper terminal.
Connect a jumpwire to the + terminal, and test your setup by touching the wire to the battery. Water should flow through the system. If not, switch the tube connections to YY and ZZ and retest. If it still doesn't flow (but the motor is running) try switching the terminal connections.