I am just about to put the camper back together but wanted to check for water line leaks and low and behold the dang pump wont work. It sounds good and when I took it apart nothing looks worn out or ...
If pumps not working make sure you purged all the air out of the hot water heater before heating up the water heater. You need the water pump to run with hot water faucet turned on to purge out the air or you could damage the water heater.
Just like you need do on a house water heater too.