I start with suppling you with what you asked for. The specs we have on a 1989 StarRay. According to the 1989 Sunline brochure, the StarRay models ranged in length from 15' 11" to 35' 4". You did not mention which model number you where looking for. The brochure shows the fresh water tank changing by the camper model, larger fresh tank for larger camper. But, it only lists that a 25 gallon grey tank and 25 gallon black tank a one waste tank size for the StarRay line. Which is sort of usual, as normally a larger camper with bunks while it has more fresh water, it often has larger black and grey water tanks. But maybe not in the StarRay line of 1989. Sunline Fan may know the history more on the tanks sizes back then.
What model is yours? Not sure if you know where the Sunline brochures are, they are located in our files section along with lots of other good info.
In our "FILES" section we have lots of info on Sunlines, you can find a lot of info there and a manual. To get to the FILES section, look at the top of the forum for the words "FILES" that is a clickable tab, click it.
Once in the files section, look for "Brochures" go in there and scroll to 1986 and download a copy of the sales brochure. And have a look around in the other categories.
Any and all questions are welcome. Pictures, also helps show us what you need help with. Posting them with your question really helps if you do not know what something is called. And we can see what it is you are talking about.
If you are going to buy a new black or grey water tank, you should check the volume by the dimensions as Sunline did offer custom upgrades. Your camper when built, may have had a lager then standard waste tanks on custom order, so use the brochure as a guide, but confirm the tank size and volume with measurements before buying one.
Hope this helps,
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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