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Old 11-29-2020, 08:31 PM   #1
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What should the grey water tank capacity be in a 2018 26.5BHS?

According to the sales brochure, grey water capacity is 65gal in split tanks. However, while boondocking over Labor Day weekend, we filled up our grey water tank with just what we carried in the fresh water tank (didn't empty the fresh water tank either). Fresh water capacity is listed as 42gal, so it shouldn't be possible to fill up the grey tank with only the fresh water tank source.
Seems like I might be missing a tank or one of the tanks is blocked.
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Old 11-29-2020, 08:46 PM   #2
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I’m guessing yours is like mine; one for the kitchen and one for the bathroom. The bulk of the water use is in the bathroom for the hand sink and shower. That’s probably the one that’s full. The kitchen has a smaller tank and less water in it. Having two tanks means you have two separate drain valves for the two different tanks. If you look I’m sure you’ll see the drain valve for the black tank and one of the gray water tanks near the drain pipe connection. After looking at the floor plan I’m guessing that’s toward the rear of the trailer. Look towards the center of the trailer for the third handle for the second gray tank. It’s probably under your slide out.
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Old 11-29-2020, 08:50 PM   #3
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I have a rear kitchen that has its own 30 gallon grey tank. The bathroom is in the center of the trailer and it has its own 30 gallon tank. Each tank has its own dump valve. The pipes from the dump valves join together before the main sewer dump valve. So if I fill the bathroom tank and the kitchen tank is empty, I can open both grey tank valves and the levels will equal out, thereby giving me a total of 60 gallons of grey water. That was never mentioned in the owners manual or during the PDI, I discovered it myself by accident and it comes in very handy.

Does yours have two grey water dump valves? Could be the same setup as mine.
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Old 11-29-2020, 09:01 PM   #4
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Does yours have two grey water dump valves? Could be the same setup as mine.
Mine only has one grey water valve.
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Old 11-29-2020, 09:06 PM   #5
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Is your bathroom and kitchen close to each other? I owned my trailer for 3 months before I discovered my second grey water dump valve...

How many tanks does your tank level gauges show? Mine shows Grey 1 and Grey 2.
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Old 11-29-2020, 09:09 PM   #6
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In the original post you said it has split tanks. If you look you may find another valve handle for the second tank.
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Old 11-29-2020, 09:17 PM   #7
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In the original post you said it has split tanks. If you look you may find another valve handle for the second tank.
There's only one grey water valve.
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Old 11-29-2020, 09:23 PM   #8
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There's only one grey water valve.
I did a little research and found your 65 split tank is 32.5 gal gray and 32.5 gal black. And as youíve already stated the 42 gal fresh water tank. So yes I know understand that youíve only got one gray water valve because youíve only got one 32.5 gal gray tank.
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Old 11-29-2020, 09:36 PM   #9
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That doesnít match what it shows on the brochure for his trailer. The grey water capacity shows 65 with the notation that itís split tanks. I would almost wager a bet that there is a second grey valve hiding some where under the trailer.
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Old 11-29-2020, 09:44 PM   #10
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I think it list the grey at 65 then notes it’s split because the other half is the black water. Jayco’s paperwork seems to always be as clear as mud.
I went to a third party website to get clearer info. https://www.rvguide.com/specs/jayco/...t/26-5bhs.html
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Old 11-29-2020, 09:55 PM   #11
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Clear as mud is an understatement. . Even if you called Jayco and talked to three people you would get three different answers. I have never seen the grey and black capacities combined to a come up with total gallons available.

Hopefully someone with the same trailer will come on with some first hand knowledge.

Past my bedtime...good night all
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Old 11-30-2020, 07:42 AM   #12
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Originally Posted by Route 66 Traveler View Post
Clear as mud is an understatement. . Even if you called Jayco and talked to three people you would get three different answers. I have never seen the grey and black capacities combined to a come up with total gallons available.

Hopefully someone with the same trailer will come on with some first hand knowledge.

Past my bedtime...good night all
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I did a little research and found your 65 split tank is 32.5 gal gray and 32.5 gal black. And as youíve already stated the 42 gal fresh water tank. So yes I know understand that youíve only got one gray water valve because youíve only got one 32.5 gal gray tank.
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That doesnít match what it shows on the brochure for his trailer. The grey water capacity shows 65 with the notation that itís split tanks. I would almost wager a bet that there is a second grey valve hiding some where under the trailer.
That makes NO sense. It is either gray or black, it ain't dark gray!

I'll assume the OP bought this thing used? When you say you only have one gray; how are you determining this? Have you got down on the ground and looked up?

My 2018 26.5RLDS is listed the exact same and has 2 gray tanks. I would be looking underneath better. One of my T-handles was lost on a trip. So, there was basically only a short rod visible until I replaced that handle.

My bath tank valve is 3+ feet in front of the black handle. The kitchen handle is another couple of feet behind the black handle.
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Old 11-30-2020, 07:55 AM   #13
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This isn't rocket science.

If he had this second tank and valve it would stay full if he has never found this second valve you guys indicate he should have.

Drain the gray tank. Completely. Leave your one and only known drain valve open.

Now run kitchen water. Is it coming out the drain?

Now run sink or shower water in bathroom. Is it coming out the drain?

If both came out the drain, well, you can figure out the rest....
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Old 11-30-2020, 11:48 AM   #14
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I have 2017 26.5BHS. There are 2 gray tanks but 1 drain valve for the gray water.
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Old 11-30-2020, 09:27 PM   #15
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I have 2017 26.5BHS. There are 2 gray tanks but 1 drain valve for the gray water.
That's good to know, what's your total grey water capacity?

Mine evidently isn't 65gal as advertised and I suspect just 32.5gal.
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Old 11-30-2020, 11:44 PM   #16
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My 2018 29.5 bhds has two grey tanks one handle right of the black tank handle one right behind the rear tire. Both drain thru the main drain port. Does your controller panel have buttons for grey tank one and two or only grey tank one?
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Old 12-01-2020, 06:34 AM   #17
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That's good to know, what's your total grey water capacity?

Mine evidently isn't 65gal as advertised and I suspect just 32.5gal.
Most of the brochures have a line about changes may be made check the unit you're buying to verify.

I'm interested in the test running water both in the kitchen and in the bathroom. Eliminating a tank in a build seems extreme.
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Old 12-01-2020, 09:40 AM   #18
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Does your controller panel have buttons for grey tank one and two or only grey tank one?
My control panel has two grey water gauges, thought one always reads empty even when the other is full.

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Originally Posted by TaftCoach View Post
Most of the brochures have a line about changes may be made check the unit you're buying to verify.

I'm interested in the test running water both in the kitchen and in the bathroom. Eliminating a tank in a build seems extreme.
This is exactly my concern, I suspect they my have eliminated a tank during the build. Curious if there are any other 26.5BHS owners out there who have the two tanks and if so, how hard would it be for me to add the second tank. The 65gal grey water capacity was a selling point for me and unfortunately I didn't dicover this sooner. This is my third RV and first Jayco and this one's given the most headaches by far.
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Old 12-01-2020, 10:40 AM   #19
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Originally Posted by Onpoint7.62 View Post
My control panel has two grey water gauges, thought one always reads empty even when the other is full.



This is exactly my concern, I suspect they my have eliminated a tank during the build. Curious if there are any other 26.5BHS owners out there who have the two tanks and if so, how hard would it be for me to add the second tank. The 65gal grey water capacity was a selling point for me and unfortunately I didn't dicover this sooner. This is my third RV and first Jayco and this one's given the most headaches by far.
Youíve got one so far

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My 2018 29.5 bhds has two grey tanks one handle right of the black tank handle one right behind the rear tire. Both drain thru the main drain port. Does your controller panel have buttons for grey tank one and two or only grey tank one?
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Old 12-01-2020, 12:17 PM   #20
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That's good to know, what's your total grey water capacity?

Mine evidently isn't 65gal as advertised and I suspect just 32.5gal.
For mine, it is definitely more than 30 gal.
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