Leaking Gray Tank

nefftracy

New Member
Joined
Sep 13, 2024
Messages
1
Location
mount vernon
Hey, all, I have a 2018 grand design momentum 357TH. We have been living in it since we bought it brand new in 2018 and when the gray tank would fill, it would back up into the bathtub we started to notice about a that wasn’t happening anymore and then realized it was leaking into the underbelly, we have never been able to find the leak and we have replaced the bottom of our trailer three times. Has anyone else encountered this? Any insight on where we should look?
 
No one checked for the leak when you had the underbelly replaced? I would think that, that would be one of the first things to check before doing it over again....

Sounds like that you would have to remove the underbelly and fill the tanks and check for the leaks. Especially around fittings and connections for lines and drains.
 
If it only leaks once it is full, it seems likely to be leaking at the top of the tank where the seal is, or in the drain pipe there. Not familiar with your model. Is there an access panel or something where you can either see the top of the tank or at least get an endoscope to get a visual on it? Fill it full and see if you can find the culprit.
 
The drain piping is just press fit into rubber grommets on the top of the tank. The rubber probably loosened up and allows water out when it is full.
 
Hey, all, I have a 2018 grand design momentum 357TH. We have been living in it since we bought it brand new in 2018 and when the gray tank would fill, it would back up into the bathtub we started to notice about a that wasn’t happening anymore and then realized it was leaking into the underbelly, we have never been able to find the leak and we have replaced the bottom of our trailer three times. Has anyone else encountered this? Any insight on where we should look?
You may have a leaking sensor on your gray tank that is corroded. I had this issue on one of my gray tanks. I had to replace the gray tank, the heater pad, insulation and under belly.
 

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