Twaller, I have a Coachmen Concord, my water pump is under the queen bed in the back of the coach. If it's not there, turn it on, turn on the water in one of the sinks and track it down by the noise. When it comes on it makes enough noise to find it.
2011 Coachmen Concord, Ford E450
DRosedale, BRosedale and Yorkies, Max, Molly, Harley