Momentum 397 water fill overflow?

[KIMandALLEN1988]

Hello. I've got a 2023 Momentum 397 with a huge fresh water holding tanks. There is a primary tank and a secondary/aux fresh water tank. The total capacity is around 140 gallons, but I do not know the exact split between the two tanks. This is the exact set up I had in our previous toy hauler, a Momentum 351. My question is this: When I use the utility panel to fill the tanks with fresh water the rear tank (aux I think) begins to spill water from the overflow line when my panel readings are between 1/2 and 2/3. It takes quite a while longer for the forward tank (primary?) to get full, start to spill out of the overflow drain for that tank and for the panel to read "full." It is not really hurting anything, other than it seems like a lot of water to waste and the spill out likely causes the overall filling process to take longer. As I mentioned we had a 351 with two tanks before this unit and it did the exact same thing when filling with fresh water. I will attach a couple of photos. I hope I am explaining myself appropriately. Lastly, the forward fresh water holding tank (primary?) has two blue overflow drain tubes, while the rear fresh water holding tank (aux?) only has one. Any thoughts on why they are not the same?
Thanks in advance! AP

 

[triplethreat]

Hello. I've got a 2023 Momentum 397 with a huge fresh water holding tanks. There is a primary tank and a secondary/aux fresh water tank. The total capacity is around 140 gallons, but I do not know the exact split between the two tanks. This is the exact set up I had in our previous toy hauler, a Momentum 351. My question is this: When I use the utility panel to fill the tanks with fresh water the rear tank (aux I think) begins to spill water from the overflow line when my panel readings are between 1/2 and 2/3. It takes quite a while longer for the forward tank (primary?) to get full, start to spill out of the overflow drain for that tank and for the panel to read "full." It is not really hurting anything, other than it seems like a lot of water to waste and the spill out likely causes the overall filling process to take longer. As I mentioned we had a 351 with two tanks before this unit and it did the exact same thing when filling with fresh water. I will attach a couple of photos. I hope I am explaining myself appropriately. Lastly, the forward fresh water holding tank (primary?) has two blue overflow drain tubes, while the rear fresh water holding tank (aux?) only has one. Any thoughts on why they are not the same?
View attachment 50029View attachment 50030Thanks in advance! AP

First, a question. Are you using the "Powerfill" setting on the Nautilus panel?

 

[KIMandALLEN1988]

Yes, powerfill on this panel:

 

[triplethreat]

Yes, powerfill on this panel:View attachment 50033

The only thing I can think of, off the top of my head is that possibly the smaller tank (the 40 gallon aux. tank) was already full. The last time you used it, did you empty both tanks by pulling BOTH of the tank drain handles?........there IS one for each tank.

There is an equalizer tube between the main tank and the aux. tank so that you only have to fill from one spot and the water will seek it's equal level. Like I said, that's the only thing I can think of right now.