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Old 07-29-2010, 08:08 PM   #1
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1970 27' Overlander
spanish fort , Alabama
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Black and Grey Tanks

I have my floor out and my black tank is cracked and has a horrible odor to it that hasn"t gone away so no desire to try and fix it. I found some tanks that are 17 gallons each that will fit in the area, do ya'll think that would be good enough for the gray water for a two day outing (tailgaiting) if I also had a rolling tank as backup. Not really worried about the black but more about the gray. Most of the time I will be using it at a park so neither will be a issue there. thanks Michael

Also the tanks are side dump, they are 30x20 so could the pipes be ran between the tanks and either remote valves or cable valve be used in this set up?

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Old 07-31-2010, 06:42 AM   #2
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1970 27' Overlander
spanish fort , Alabama
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Would a drawing help? Does it make any sense?

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Old 07-31-2010, 07:24 AM   #3
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Hello tripod58,

Photographs of what you have and sketches of your proposed configuration would be helpful.

For us 17 gallons would work for a short weekend but I would want more than this if at all possible. Are you proposing to reduce the size of the black tank in order to gain the gray?

I seem to recall members who have added gray tanks without reduction in capacity. It may be worth some research. Here's a link that may be helpful.



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Old 07-31-2010, 07:39 AM   #4
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For the 2 of us , 17 gal. would last 1 day. I would try to go as big as possible for the gray.
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Old 07-31-2010, 09:08 AM   #5
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Also depends on how much fresh water capacity you need to have grey tank capacity more than fresh when boondocking - you won't have the water to fill it. So if your fresh water is only 20 -25 gals. or so, your grey at 17 gal. is about right...

FWIW, we added two gray tanks (plus a black) in our '56 Safari instead of one larger one...they are linked together so both fill equally. We found that we could fit two smaller ones inside out frame better than one large one. So far, it's worked out great!

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