Tank locations for 260RD

[Grandesigner]

My fresh tank only reads 1 or 4 red dots (empty or full), so I'm guessing the sensor connections are loose. Has anyone dropped the coroplast to find where each tank is?
Of course my black tank lies all the time and I would like to replace the sensors with better ones also...

[TerryH]

I'm assuming there should be a white PVC dump valve and blue overflow hose protruding from the colorplast. Those are attached directly to the fresh tank.

[Second Chance]

As @TerryH said, the fresh water dump valve tells you where the fresh tank is. On the GD fifth wheels, the fresh tanks are usually somewhere over the rear axle with the dump on the street side just behind the axle. Our fresh tank sensors are OK and we've managed to keep black tank sensors working long-term using the flush. It's our gray tanks that are problematic. If I were motivated to drop the Coroplast and get up in there, I would replace everything with these:

https://www.garnetinstruments.com/rv-shop/products/

Rob

[Grandesigner]

Thanks, those clues make perfect sense for the fresh tank. It's the black tank with no clues. I'd hate to have to due exploratory surgery if someone has been there before.
I'll check into those sensors. I had used the type with the long cover to prevent TP from sticking to the sensors with success in the past...

[Second Chance]

Thanks, those clues make perfect sense for the fresh tank. It's the black tank with no clues. I'd hate to have to due exploratory surgery if someone has been there before.
I'll check into those sensors. I had used the type with the long cover to prevent TP from sticking to the sensors with success in the past...

Black tanks are nearly always as close to directly under the toilet as the designers can get them... for obvious reasons.

Rob

[Grandesigner]

That is also a good clue...I guess what would be nice is enough info to make a few cuts to access the sensors so that I can then just tape up those cuts with the correct tape that I already have from a previous 5W. I would like to avoid pulling it down from the edges.
Anyone have that kind of info?

[TerryH]

That is also a good clue...I guess what would be nice is enough info to make a few cuts to access the sensors so that I can then just tape up those cuts with the correct tape that I already have from a previous 5W. I would like to avoid pulling it down from the edges.
Anyone have that kind of info?

Tank layout diagrams are available from GD. Call customer service and see if they can provide it. A member of my 29G/31G Facebook group was able to get a tank diagram from them for the 31G's.

[Grandesigner]

I will give that a try, thanks!

[Grandesigner]

Here is the response I just got from them...

"Thank you for reaching out. Sorry to hear of this happening, I would not suggest cutting into the underbelly material. My recommendation would be to drop the underbelly in order to gain access to that area. We do not advise cutting into the underbelly."

[Grandesigner]

Any comments on this? What is so special about GDs coroplast that it should not be cut and taped?