Evasive water leak issue near city inlet

[Coopdejour]

Any thoughts?
I have a 2016 25' Flying Cloud rear bed, water emanates from behind the city water inlet, not a steady drip, but when I stuff a paper towel around the fitting it gets soaked. The dealer has already replaced the fitting. It seems to occur when I turn on the hot water heater, either electric or gas. The towel gets wet and then when I replace the paper towel that towel stays dry for awhile.
The tech that initially did the first repair said the problem was coming from the hot water heater. After the service call, it appeared to be dry for awhile. Now it's happening all over again.
Why would the leak be in between the two skins? The fiberglass wool is getting wet.
Thought it might be a roof leak from the A/C mounting gasket, but have ruled that out, due to the hot water heater relationship. If I could access the darn leak I could monitor and repair it myself.
Thankyou for suggestions.

[AtomicNo13]

Try tightening the 4 screws on the backside. As the water heater heats the water the pressure in the line increases and the water can escape from this area. There should be a gasket here but there is not..

[Coopdejour]

I hadn't paid attention to those screws, your suggestion makes perfect sense and I have tightened them. There was about a 1/2 turn available on each, was careful not to strip the threads. Have turned on the hot water heater, put the paper towel in place and keeping fingers crossed. Will let you know.
Thank you for the tip.

[AtomicNo13]

Mine did the same thing... Until those screws were tightened!

Good luck

[AtomicNo13]

Additionally, if your inlet ever leaks on the outside, you can remove those same 4 screws to clean out any accumulated crud from the check valve and make it good as new!

[Coopdejour]

AtomicNo13
You are the man!
The hot water heater has cycled off and the paper towel is dry!
If it stays dry you have resolved our issue for us!
Will let you know 48 hours down the road if we are definitely out of the woods.
Thank you for taking the time to point me in the right direction.

[AtomicNo13]

Sure thing...
Been there done that!

[HiJoeSilver]

If you notice water dripping from the TPV valve on the water heater it's caused by the same thing. Increased pressure as the cold water heats up and expands and has nowhere to go. Just a heads up if you notice it after the fix. It's ok to live with it.
You can install a small accumulator in the system to allow expansion space if it bothers you. You can also connect a air compressor to a blow out plug at the water inlet the open a hot water faucet until air comes out. This puts an air bubble in the top of the water heater to allow expansion space as well. The air slowly dissolves into the hot water and goes away and has to be readied from time to time.

[AtomicNo13]

It's a good idea to drain the tank every 2 months to recreate that air bubble, more often if you're a full-timer. Manual discusses thus issue.

[Coopdejour]

AtomicNo13,
We are still dry. Thanks again for the help.

Happy Trails!

[AtomicNo13]

I was thinking about you this morning ..... Glad to hear the good news!

[TYSON PECK]

I learned the same lesson then started examining the trailer regularly for loose screws. Even found a few in the circuit breaker box. Amazing what a house vibrating down the road can present in the way of issues.

[Coopdejour]

You are absolutely correct. In fact, I firmly believe that if you aren't willing to get your hands dirty or you really don't have any hands on ability whatsoever, the expense of owning any rv can go up faster than your blood pressure, unless of course you have deep pockets!