Originally Posted by tlavergne
I have a 1978 Ambassador. There is a threaded plug in the bottom of my fresh water tank that has a slow drip. About a drop every few seconds. This tank was replaced by the factory about 5 years ago and has never leaked. I winterize it every year by draining that tank. I can't figure this slow leak out. I don't believe it is coming from the threaded plug but I will remove that, wrap it with teflon tape, put it back in and check it anyway. I think it is up higher and is just dripping out of that spot. All I can think of is that perhaps I have a loose clamp and it is dripping back from the water hose going to the pump. It will drip days after I have put water into the tank so I do not think that it is spillage from filling the tank. Any suggestions?
You need to find the source of the leak.
In your case, that should be an easy problem.
Dump several ounces of red or green food coloring into the water tank.
Add some water to the tank, which will mix the coloring with the water.
Look for the colored water source.
CAUTION: DO NOT RUN THE WATER PUMP.
Once you have found the leak and fixed it, double check the fix.
Then empty the water tank, and refill it with water again.
The very small traces of food coloring that may be left in the water tank, offer no consequences.