I assume you have a fresh water holding tank so you must have a fill cap for it, the water heater is also connected to the fresh water tank hopefully..
I could be wrong, probably am, but that doesn't look like a fresh break.. it may have been cracked for a while.. fixing it is beyond me but thanks for the picture and it may help...
That looks like no pick-up tube I've ever seen.. looks like a pipe plug. In any case hold the large fitting with an open end wrench and then remove the small square fitting..
My drive was leaking at the Oring and pumping water into the shift cavity. I never knew it until I took the big plastic cover off the top of the engine and could see it coming out of the lower cable..