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Open Roads Forum  >  Tech Issues

 > Black Water Tank Missing Capacity

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scoobybri

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Posted: 09/09/19 04:00pm Link  |  Quote  |  Print  |  Notify Moderator

We just bought a used 2015 Cruiser RV Fun Finder F233RBS. It is a 24 foot travel trailer and we love it. We have been RVing for awhile so I'm knowledgeable about tank maintenance on these types of RVs. On our first outing out, we had some odor problems in the bathroom. After a normal dump and chem treatment, we still had an issue the next time out. I checked the P-trap in the sink and the vent on the roof and everything was fine. So I decided to do a full black water tank soak for a few days with some Oxyclean to see if I could get any dried on solids that may have been stuck in there from the previous owners. The spec for the black water tank that I got from calling Cruiser is that the camper has a 38 gallon black water tank. So I measured 5 gallons into a bucket and began filling the tank 5 gallons at a time. By the time I got to 30 gallons, the tank was full! As in water was backed up into the toilet. I drained it after a few days and got no additional solids. Filled it again and got to 30 gallons when it was full. What gives? I can't believe that there are 8 gallons of dried waste in the tank. I guess it could be possible but it seems unlikely.

Any ideas?

Johno02

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Posted: 09/09/19 04:27pm Link  |  Quote  |  Print  |  Notify Moderator

may be an air bubble, or they lied


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Bill.Satellite

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Posted: 09/09/19 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

If you shine a light down the toilet, do you see anything that looks like it's not the flat bottom of a tank?


What I post is my 2 cents and nothing more. Please don't read anything into my post that's not there. If you disagree, that's OK.
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Flute Man

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Posted: 09/09/19 04:34pm Link  |  Quote  |  Print  |  Notify Moderator

I suspect that they did not give you the right number.
Jerry Parr

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Posted: 09/09/19 04:36pm Link  |  Quote  |  Print  |  Notify Moderator

Can you get to the outside of the tank to do some measurements? If so, you can calculate the approx. capacity. If you're getting less than that, it could be "stuff" or an air bubble like was mentioned.

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Terryallan

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Posted: 09/09/19 04:36pm Link  |  Quote  |  Print  |  Notify Moderator

I'm betting it is just a 30 gal tank, and it was mistakenly installed. the brochure claims 38 gal


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Lwiddis

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Posted: 09/09/19 04:55pm Link  |  Quote  |  Print  |  Notify Moderator

Thirty gallons for a black tank is sufficient for a long time.


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Bill.Satellite

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Posted: 09/09/19 05:07pm Link  |  Quote  |  Print  |  Notify Moderator

A number of people making "assumptions"! Why would a manufacturer lie to its customers?

STBRetired

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Posted: 09/09/19 05:55pm Link  |  Quote  |  Print  |  Notify Moderator

Easiest way to make sure is to crawl under the trailer and look at what is marked on the side of the tank. Then you know for sure. I would guess that there is a "downpipe" where the toilet is mounted to the tank that extends a few inches into the tank. When water reaches the bottom of the pipe, you end up with an 8 gallon trapped air bubble.


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ItsyRV

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Posted: 09/09/19 06:37pm Link  |  Quote  |  Print  |  Notify Moderator

Or, you're not actually emptying all the waste in the tank. There could be a small blockage built up at the valve "ScoobyBri Dam, the 174th wonder of the world" causing a reduction in new holding capacity.


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