[Richard]

The best thing to do is to take flashlight, pen, and paper to sketch the valves and piping in your water bay. All the valves should be visible. Keep in mind that for water pumps to work, water must be able to flow into them from the water tank. Most Newells do not have valving leaving the pumps. Also, you can fill the water tank via a hose hooked to the city connection, or from separate fill ports at the top of the water bay.

The sewer dump has a counterintuitive valve setup. The black waste dumps directly into the tank. The gray waste all dumps into the external drains, and the external drain runs into the black tank at the dump valves. The normal setup will have the final valve closed, and the grey water valve open. That allows the grey water to run into the tank, yet keep any waste from dumping. If you are in a situation where you can dump grey water directly to the ground, you can maximize your tank volume by closing the grey water valve into the waste tank, and opening the main dump valve. That way black waste stays in the tank, and grey water simply drains out the open dump valve.