The water pump is usually installed close to the water tank so check there also turn on the pump and listen for it. It will probably be inside or under a cabinet and you will have to remove a "panel" so look some screws. On my Cruiser the tank is in the rear and the pump is in a cabinet between the two chairs above it and under the shelf there is a panel that I remove. I had a Salem and the tank was over the front axle and the pump was under the sink and I had to remove the floor of the cabinet to access it.
As for a bypass it should have one - should - but your camper is 6 years old and I am guessing new to you so the previous owner could have changed something.
2005 Cruiser 29CK
2008 GMC 2500hd 4x4
Crew cab Long bed 6.0 gas
4.10 gear ratio