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Old 05-20-2012, 02:53 PM   #1
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Angry Can this happen?

We just bought a 2006 Sierra Sport 27'. We decided to try everything out before the big Memorial weekend trip. Filled the fresh water tank and a little later noticed that the black water tank seemed full. A few hours after that the fresh water tank was all but empty (106 gallons but not sure it was totally full because it seemed to fill faster than expected) and the black water tank is totally full. Can the black tank somehow siphon from the fresh tank? I didn't think that was possible but I have no other explanation. I hope someone can help us out. We were so excited to go out this weekend but that won't happen without a working water and holding tank system.
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Old 05-20-2012, 03:50 PM   #2
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only thing i can think would cause this is that you have a black tank rinse and you hooked your hose up to that instead instead of the fresh water tank fill.
look at this basic rv plumbing system diagram...i don't see any way for the water to siphon from the fresh water tank to the black water tank...
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Old 05-21-2012, 12:44 AM   #3
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Don't think you have 106 gallon tanks for starters, as no camper does. That would add 1000 pounds of weight, and a tank that size is not going to be in a 27 foot trailer. Your total, of all the tanks, may be 100 gallons, and 6 more in the water heater. If you filled the fresh tank, how do you know it was full? (don't really believe the indicators) Did water come out the overflow?

The only way water gets from the fresh tank to the black tank, is through the toilet. If you had the pump on, it would have run constant, and you should have noticed. Usually the toilet would have overflowed first, if the ball was in place, stopping water from going down, even if the valve leaks.

As mentioned, did you hook to the flush for the black tank?

Tank sizes are probably, 40 gallons fresh, 30 gallons gray, and 30 gallons black, with 6 gallon water heater, total 106 gallons.
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Old 05-21-2012, 08:12 AM   #4
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Windrider, the OP appears to be correct, I looked up a few of his unit listings and they all list, 100 Gallon Fresh Water Tank, 34 Gallon Black Water Tank, 44 Gallon Grey Water Tank. Seems high and I would not want all that extra weight, but it seems correct. Although the Black tank is only 34 gallons so some thing else is a miss here, if the fresh water tank was empty, or the OP only had 34+ gallons in it?
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Old 05-21-2012, 08:35 AM   #5
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When we got our Forest River Wildcat Sterling last year the tags listing the correct water hook ups were wrong and it told me that my fresh water connection was the actual black tank rinse was located. the only reason I caught it was the connector itself says black tank rinse only. check to see if your tags are incorrect. also the tags listing the dump tanks were incorrect also, if you can check them before using the rig I would do that also.
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Old 05-21-2012, 08:43 AM   #6
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Drain F/W tank & black tank,leave drains Open.hook up hose see where water comes out. Youroo!!
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Old 05-21-2012, 09:00 AM   #7
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Quote:
Originally Posted by realebill View Post
only thing i can think would cause this is that you have a black tank rinse and you hooked your hose up to that instead instead of the fresh water tank fill.
look at this basic rv plumbing system diagram...i don't see any way for the water to siphon from the fresh water tank to the black water tank...
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Old 05-21-2012, 10:00 PM   #8
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First off, yes after checking, we do have 2 50-gallon fresh water tanks. We also have an outdoor shower so that would account for the water that does not fit into the holding tanks, and it will be great for washing off all the dust/mud before going into the trailer.
Not sure what my neighbor did, he has a unit similar to ours, but after dumping the holding tanks and refilling water everything seems to be fine.
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Old 05-21-2012, 10:20 PM   #9
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First of all, don't want to start anything here. Now post number 8, by the original poster, "not sure what my neighbor did"........ When did the neighbor get involved?

Sorry. all we know and can help with with is what someone writes and we are able to read.
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