Trying to understand my capacities, Dealer says I have 2 grey tanks and 1 black, my control panel shows a black and a black tank 2 filling and only 1 grey tank filling (and fills very fast) while the grey tank 2 never fills. What are my actual capacities and tank configurations? It doesn't seem like I have 78 gal of grey. Is the garage bathroom both the grey and black tank? Can I get the holding/fresh water tanks diagram/schematic?
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2021 Momentum 351M Holding Tanks Configuration
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Welcome Jammb - I have a copy of the 351M DWV plan - Here's how the drawing shows it's configured.
Combined black/gray - Rear Bath - toilet, washing machine, rear bathroom sink.
Middle Gray - Kitchen sink
Forward Gray - front bathroom sink, shower
Forward Black - Toilet
Unfortunately, the drawing and the GDRV parts lookup page does not indicate the capacity of each holding tank. I'm assuming that all four tanks are 39 gallons, but I'll have to defer to a Grand Design employee to confirm that.
GDRV-Megan - Can you please confirm the capacity for the two gray, one black, and one black/gray combination holding tanks?
Thanks,
JimJim and Ginnie
2024 Solitude 310GK
GDRV Technical Forum Moderator
GDRV Rally Support Coordinator
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Originally posted by JAMMB View PostTucsonJimGDRV-Megan Thank you for the information. Also, Am I able to somehow combine the middle and forward gray tanks to flow into each other?
Thanks,
Josh
You can close the added valve, and open the two gray valves on your RV. This will allow for the contents of both gray tanks to equalize. This is a very common way of accomplishing that goal.
https://smile.amazon.com/Valterra-T5...0803061&sr=8-2
JimJim and Ginnie
2024 Solitude 310GK
GDRV Technical Forum Moderator
GDRV Rally Support Coordinator
Comment
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Originally posted by TucsonJim View PostWelcome Jammb - I have a copy of the 351M DWV plan - Here's how the drawing shows it's configured.
Combined black/gray - Rear Bath - toilet, washing machine, rear bathroom sink.
Middle Gray - Kitchen sink
Forward Gray - front bathroom sink, shower
Forward Black - Toilet
Unfortunately, the drawing and the GDRV parts lookup page does not indicate the capacity of each holding tank. I'm assuming that all four tanks are 39 gallons, but I'll have to defer to a Grand Design employee to confirm that.
GDRV-Megan - Can you please confirm the capacity for the two gray, one black, and one black/gray combination holding tanks?
Thanks,
Jim
Josh
Comment
-
JimJim and Ginnie
2024 Solitude 310GK
GDRV Technical Forum Moderator
GDRV Rally Support Coordinator
Comment
-
Originally posted by TucsonJim View PostWelcome Jammb - I have a copy of the 351M DWV plan - Here's how the drawing shows it's configured.
Combined black/gray - Rear Bath - toilet, washing machine, rear bathroom sink.
Middle Gray - Kitchen sink
Forward Gray - front bathroom sink, shower
Forward Black - Toilet
Unfortunately, the drawing and the GDRV parts lookup page does not indicate the capacity of each holding tank. I'm assuming that all four tanks are 39 gallons, but I'll have to defer to a Grand Design employee to confirm that.
GDRV-Megan - Can you please confirm the capacity for the two gray, one black, and one black/gray combination holding tanks?
Thanks,
Jim
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