I have an old 1960s camper and the water tank is confusing me. When I try and fill it, drains out of a drain hole in the bottom of the camper. When I plug the drain hole, the water almost immediately seems to overflow out of the fill spout. I thought maybe it was full or something and the drain hole is overflow but I can't find what would be the real drain hole if this was the case.
The sink pump inside the camper wasn't pumping anything, so I plugged in a new one and it's not pumping anything either. I took off the new one and put the flanged part that goes into the hose into a cup of water and it didn't pump anything again.
Are both my pumps broken? What's going on with the water tank?