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Old 12-02-2013, 08:48 PM   #1
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Putting in larger black tank?

Have a 2011 Sunseeker 3120. I like this rig except for the small tanks, especially the 31 gallon black tank. I can't go more than than a couple of days when dry camping before it's full. Same for the grey tank. I've got this idea about somehow putting in a larger tank(s). Has anyone attempted this or seen any article on this. My wife wants to sell it because of this. Thanks, Randy
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Old 12-02-2013, 09:30 PM   #2
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Don't know about adding larger tank, would have to pull underbelly to see if there is room. However, I'm more surprised that youvfill a 31 gal black tank in a couple days. We frequently camp with no hookups. There are two of us and we can easily go 4 to 5 days and not fill up. Our camper has a 38 gal tank, so not much larger. If you are going by the monitor panel they can be notoriously incorrect, especially the black tank that can get gunk on the sensors. Can always shine a flashlight down and do a visual level inspection until you get a better feel for the real level. Just food for thought.
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Old 12-02-2013, 09:37 PM   #3
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My wife, I and daughter were "filling" our black tank every other day to every 3rd day based on the monitor panel. When dumping the tanks a lot of stuff came out. The last couple of trips that we've had- I've waited longer until the toilet actually started burping at me when we would flush and we've been able to stretch that another day or two. But, we have a 42 gallon black tank.

Tom's right - you need to look inside the underbelly of the camper to see if there is room. Your alternative is to get a macerator pump and big Blue Boy tote and pump the black water into the tote (which, with a macerator pump, can live in the back of your truck so you don't have to roll the thing or deal with the weight).
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Old 12-02-2013, 10:03 PM   #4
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2013 models have larger tanks at 39 gallons so there is room for them. However it's not that much bigger and I don't know if there is enough space to slide them in after the unit is built.

I have a 2012 3120 with the smaller tanks and always thought if I found them to be too small I could add additional tanks in the rear storage compartment that goes all the way across. Gray tank would be a simple plumbing job but the black tank should use a grinder pump to transfer to the extra tank.

If you need more fresh water that could be accomplished by adding another tank on top of the current tank under the rear bed.

The other thing I don't understand is how you can fill both tanks when dry camping since the total available waste tank capacity is 60+ gallons and the fresh water tank capacity is only 44 gallons. Are you sure the tank monitors are working correctly?

Also if you want much larger tanks you will likely have to go up to a large Class A as the Sunseeker tanks are typical of Class Cs and smaller As.
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Old 12-02-2013, 10:20 PM   #5
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how are you filling up a 30 gallon black tank in a couple of days?

we almost only dry camp and our black tank is only 25 gallons. we can go for 3 straight weeks before we have to dump our black tank.
but our black tank is only for the toilet, not for shower or sink.

does your black tank have shower or sink water drain into it? that's the only way i can see your black tank filling that fast.
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Old 12-03-2013, 12:32 AM   #6
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I had the same issue years ago with the wife and kids. To solve the issue I educationed them on flushing with little water, quick showers only using water to wet yourself and to wash the soap off, and washing dishes with very little water. It is a learning transistion. You can also let them dump the tanks, that will reinforce conserving water.
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Old 12-03-2013, 04:42 AM   #7
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My unit has I think the 38 gal black tank, I do not use the sensors being they are normally wrong. We have gone for 5 days without dumping. I keep trying to extend the time each trip. So I guess I do it by day's not buy the sensor. I still had to add water to fill the tank. I took a flash light and looked down the sewer pipe, still did not see any water in it then after 5 days. That's a lot of sewage it takes to fill it up. We always just use a 1/4 bowel to flush. after we flush we add a 1/4 bowl again of water.
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Old 12-03-2013, 07:29 AM   #8
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31 Gallons, I would say something other than the toilet is emptying into your black tank. Either that, or you guys are doing some super long flushes.
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Old 12-03-2013, 07:45 AM   #9
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Quote:
Originally Posted by bikendan View Post
how are you filling up a 30 gallon black tank in a couple of days?

we almost only dry camp and our black tank is only 25 gallons. we can go for 3 straight weeks before we have to dump our black tank.
but our black tank is only for the toilet, not for shower or sink.

does your black tank have shower or sink water drain into it? that's the only way i can see your black tank filling that fast.
We're the same as Dan......something seems odd that you would be filling a black tank that quickly.
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Old 12-03-2013, 09:16 AM   #10
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I would have to agree with the crowd that says something else is going on with the black tank. Ours is a 30 gallon tank on our 06. When we go to nationals it's me, the wife, and 2 kids, we go 5 to 6 days before we have to dump.
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