How to find a leak in potable water tank on motor home

You could dump some cheap food dye in the tank. Easier to see then clear water.
My first guess is a poor connection on the tank and not the tank itself.
Sensors are normally spun into the tank. Hard to repair.
There is some small expansion seals available and repacement sensors that use the expansion type installation method.

Does the fresh water leak if the rv is standing still? Or only when driving.

I may be wrong but I think the floor has to be cut to get to the plumbing and tank.

Have you looked around the pump for leaks?

If you can attach a small diameter clear tube to the tank (perhaps at an existing drain valve) and lead it up to a convenient place to observe, the water level in the tube will be the same as in the tank. It makes an accurate water level monitor.

IF the tank itself is cracked? don,t just smear some sealer over it. theres more to the repair.

You can buy endoscopes for a smartphone for under $40 now. Might be able to poke it around from the sides.

I see your a ohio guy too, tuff working outside ,and its gonna get colder. if you need a great repair shop? campers care ,on rt 14teen not far from deerfield.ohio good work fair price.and they have a heated shop.

pianotuna wrote:
Does the fresh water leak if the rv is standing still? Or only when driving.

both

Dou you have access to the sensor locations?
What about the pipe connections?

Where is the tank located ?
As far as the propane gage, are you talking about the one on the wall inside, or the one on the tank itself.