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Old 09-27-2018, 05:05 PM   #1
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Holding tanks

What size are the holding tanks in my 05 25' sunline?
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Old 09-27-2018, 11:12 PM   #2
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Hi Jon,

Holding tanks were all different depending on the floorplan, and there were a few that are about 25'. Do you know your model number?
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Old 09-28-2018, 04:56 AM   #3
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I have a T-2553. Rear bed room, center bathroom forward kitchen (I think the same one that's on the home page for this site).
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Old 09-28-2018, 07:21 AM   #4
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40 gal. fresh, 35 gal. gray, 25 gal. black according to brochure.
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Old 09-28-2018, 01:20 PM   #5
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Thank you.
I saw in a deconstruction photo on this forum a clock hanging by the door. Did they come with the campers? I have the same clock by the door in my camper.
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Old 10-01-2018, 07:58 PM   #6
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Quote:
Originally Posted by camper Jon View Post
Thank you.
I saw in a deconstruction photo on this forum a clock hanging by the door. Did they come with the campers? I have the same clock by the door in my camper.
For your year, yes. Clocks were pretty much standard from the early '90s through 2007.
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2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR
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Old 10-04-2018, 11:57 AM   #7
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General info on determining the size of a flat-sided tank...
Crawl underneath with a tape measure and get the height, width and depth...

For example in my old Fleetwood Class A the literature was contradictory - one brochure said that the fuel tank was 40 gallons, another said 60.

So I measured mine...
Numbers: 54 inches from front to back, 26 inches wide, and 13.5 inches tall...
54 times 26 times 13.5 equals 18,252 cubic inches...
There are 231 cubic inches per gallon... so my tank was roughly 82 gallons!
(Yes, in the calculations I was ignoring the thickness of the walls of the tank)

So both brochures were wrong!
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Old 10-04-2018, 11:17 PM   #8
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On the Sunlines, the brochures used the wording fresh water "system capacity". It said my camper had 40 gallons. So I took that as meaning the physical tank was 40 gallons. Then one day I measured the outside of the tank, length, width and height and came up with cubic inches and divided by 231 cubic inches per gallon.

Well no way did I have a 40 gallon tank. What I thought I had is 6 gallons of water in the water heater, 2 gallons in the piping system and 32 gallons in the fresh tank by backing in from the 40 gallons as shown in the brochure. In reality I would have 32 gallons of usable water until the pump sucks dry but I have added 40 gallons of weight when I started. All depends on what one is wanting to know.

Then last year I dropped my fresh tank down and low and behold, on top of the tank is molded in, 38.5 US gallon??? Now I'm not sure how they figured this. If I add the 6 gallons of water heater, 2 gallons of piping and 38.5 gallons of max tank capacity as stamped in the tank, I would have 46.5 gallon system.

In my case, I made a bad assumption on the wording they listed in the brochure for the freshwater. They did preference the rating with "approximate". Do not know how much rounding up or down they use.

They use the same wording (system capacity) on the gray and the black tank. Those tanks are rounded and not as easy to back calculate. I have not tried yet either. For the black tank, there is only a short piece of pipe between the toilet and the tank, so that might be the tank size. For the gray, well there are a lot of 1 1/2" pipes that can fill up before water backs up in the shower. At this point short of filling 5 gallon bucket of water and pouring it down the drain to measure how many gallons I can put in, makes me really not know what the gray tank size really is.

Thanks

John
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Old 10-05-2018, 06:06 AM   #9
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Great info, John. I was unaware that Sunline included pipe capacity in their tank numbers.
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