It is probably either under a dinette seat or possibly in the bottom of a cabinet. Look for the water tank, it is usually mounted close to it. Typically on the side where the water fill is. Based on a floor plan I found, I would guess it is on the left side under the dinette seat, that is based on the assumption that the dinette is in the front. Your water tank may be mounted under the floor, if that is the case the pump may be under the sink area, possibly behind a panel.
You could have a blown or loose fuse. Check the fuses in the fuse block, in many cases there will be a secondary fuse inline near the pump. It could even be something as simple as a loose connection.