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Old 07-16-2015, 12:25 PM   #1
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Black Tank Capacity on the Comumbus 340RK

I am hoping to get some help from the forum or Forest River folks who may be monitoring threads on this forum.
We bought a 340RK this past Feb and now are on our first long trip from Dallas to Oregon. I am finding that the black tank fills to 2/3 within 24 hours. We are three of us, using the toilet and public facilities in the RV park and when we are out and about. I really do not believe we are dumping more than 5-8 gallons of waste a day.
Can anyone shed some light as to what the issue may be. The specs show a black tank capacity of 43 gallons.

Thanks,
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Old 07-16-2015, 12:27 PM   #2
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Don't believe the tank monitors.
Wait till full then dump.
2/3 may be closet to half depending on where they mounted the probe.

We are a family of 5 and didn't fill our 35 gallon black tank in 3 days

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Old 07-16-2015, 02:39 PM   #3
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The only sure way is to measure. After a good flushing, get a bucket and fill it to the brim. Then dump again.... We use lots of "Wet Ones" (Walmart) to conserve water...
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Old 07-16-2015, 02:40 PM   #4
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Problem is you definitely want to use the maximum amount of water allowing you to get thru your stay.

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Old 07-16-2015, 03:16 PM   #5
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Quote:
Originally Posted by TheRamaraos View Post
I am hoping to get some help from the forum or Forest River folks who may be monitoring threads on this forum.
We bought a 340RK this past Feb and now are on our first long trip from Dallas to Oregon. I am finding that the black tank fills to 2/3 within 24 hours. We are three of us, using the toilet and public facilities in the RV park and when we are out and about. I really do not believe we are dumping more than 5-8 gallons of waste a day.
Can anyone shed some light as to what the issue may be. The specs show a black tank capacity of 43 gallons.

Thanks,
Two things can happen:
1. Probes are mounted low and indicate as such. Where 1/2 tank shows on the 2/3 probe. Common, I've had it in two units.

2. M/T and flush the tank. Calibrate a 5 gallon bucket for 4 gallons and add 11 buckets or less and fill till level reaches toilet base. That's your true capacity, - a gallon or two for margin. While filling check your level lights and note the gallons at each level. The tank may be less than advertised size, no surprise.
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Old 07-17-2015, 06:49 PM   #6
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We also have. 340 and are able to go for a week to 10 days using sparingly. Normal 3 day weekend will be 1/4 to 1/3 full but the 2/e light will be on. 2/3 light comes on at less than half tank. As mentioned empty and fill measuring and checking when sensor light comes on.
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Old 07-21-2015, 08:16 PM   #7
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I also have the 340RK I have never filled the black tank after a week of 3 people use.. We use a lot of water during the flush and never believe the sensors.. The kitchen gray water sensors are also a bit wonky.


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Old 07-21-2015, 08:55 PM   #8
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Another thought, there might be and probably is, semi digested tissue or other waste debris on the sensors inside the tank. The only way to remedy the situation is to fill the tank approximately halfway and drive, hopefully the swishing around in the tank as you drive will clean off the sensors. It has worked for me and I added a bucket of ice cubes also. I did see where a test was done and the cubes didn't work but it did for me!
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Old 07-21-2015, 09:17 PM   #9
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X2 on the ice cubes...always dump all extra ice in as we get ready to leave for home.
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Old 07-23-2015, 01:06 AM   #10
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Thanks to all of you. I notice now that the tank lights at 1/3 when used about 5 times and then goes to 2/3 in a day, staying at 2/3 for a full four days. I am not sure about the sensors and toilet paper getting stuck as it shows empty, goes to 1/3 and to 2/3. Best advise you all gave me is to learn how it behaves and that is what I did.

Sorry for the late response. We were at an RV park in Diamond Lake with not wifi and internet access the past 6 days.
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