having the valves facing top/bottom is that on or off lleft to right is that on or off. The manual we have does not have that page? The water pump is there an easier way to drain it? i know it ...
If Old Biscuit picture does not answer your valve question, then we will need more information. Like what make, year, model and the valve service.
As to the potable pump, some have connections that are easily detached, some you have to pull a hose off. Again, if we knew what the pump was, there is a much better chance of a correct and simple answer.