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Old 07-16-2006, 04:25 PM   #1
martha123
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Default Black water tank issues

We have a Sun Voyager that supposed have a 40 gallon black water tank. We just camped for 2 days (2 of us) and the black water gauge read full within 48 hours and we used the campground restrooms part of the time. We have complained to our dealer numerous times and can't get any satisfaction. After we just dumped, it still read 1/3 full. I did see some posts saying some of these tanks are much smaller than the brochures claim. Also, my husband claims that the kitchen sink dumps into the black water tank. Would Gulfstream ever be so foolish as to design that? I'm getting to the point where I only feel safe camping where we have full hookups. Any other Sun Voyager owers have this problem?
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Old 07-16-2006, 05:20 PM   #2
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Are you SURE the tank was really full?

Those tank-gauges are notoriously-inaccurate, especially the black-water one. All kinds of .....uuuhhhh... "stuff" .... gets stuck to the sides of the tank and to the sensors during usage and causes them to read inaccurate. There's a lot of different home-remedies and various 'fool-proof' solutions to solving the problem, but I found that just keeping track of usage is just as good.

I also use one of those sprayers that you stick down the toilet and it sprays a jet of water all around inside, seems to do well (for me).

As far as the sink being connected to the black-water tank, I've heard of some rv's being made that way before but don't know if it's true. Easiest way is to open the gray-water tank outlet and run the sink. If water doesn't come out, he was right. Would GS do that? Wouldn't surprise me a bit!

Thanks!
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Old 07-16-2006, 09:20 PM   #3
GStream40
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As was mentioned the gauges are not accurate because of toilet paper and other things being stuck to the sensors.

Also, most people don't realize it and the dealers do not tell the new owners that one should hold the button in for a while sometimes up to a couple of minutes for the low current to dry off the sensors, then you will get a more accurate reading as long as material is not shorting out the sensors in the tank.

I have heard of the bathroom sink and shower being connected to the black tank, but haven't heard of any manufacturer doing that for many years. Never the kitchen sink.

The best way to check is to open the gray water dump valve, then run water in the kitchen, after you verify that water comes out while running it in, do the same for the bathroom sink and shower. That way you will know what is connected to which tank.

You probably do have a 40 gallon black tank, just the good old inaccurate sensors giving you false information. I know ours does a lot of the time when we are using the toilet in the coach.

Ron
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Old 07-18-2006, 03:43 PM   #4
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Our bathroom sink runs into the black water tank. this adds needed water to help flush out the solids. We have a 75 gal. black and gray tanks. Our gages are never right. We have had five rigs with gages on the tanks and they have never been right. Had one service person tell us the black water sinceres are right under the toilet so they are alway wet.
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Old 07-25-2006, 06:09 PM   #5
martha123
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Default Black water tank

We have confirmed that our kitchen sink does dump into the black water tank and that probably explains most of our problems (other than the fact that the sensors probably don't work correct too). I guess at this point there is nothing we can do but I wish there was. How could Gulfstream be so crazy?

Martha
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Old 08-12-2006, 10:43 AM   #6
dbmotors
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Two comments I can add. One, I have looked at my black tank (actually, all three of my tanks) and the sensors are located in odd areas. For example, the "full" sensor is located probably 3" from the top of the tanks. I too was having my black tank read full within a very quick time, but in reality, the tank is not full.

Second, my black tank frequently reads full even after I empty it. As was stated, if something is touching the sensor (like toilet paper), it will trigger that light. I no longer put much faith in my guages...
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Old 08-13-2006, 08:27 PM   #7
coolchas11
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Default Black Tank

We, too, have a Sun Voyager with similar reading problems as you do. After dumping, connect the garden hose to the outside line leading into the tanks. Close the black tank valve and fill with a lot of water. Empty. Repeat process. Then keep the valve open a run the water into the tank. It will spray into the tank. This usually does it for me. Also, we just returned from NY State and traveled with a few gallons in each tank. Boy, did it clean out the black! I'm also assuming that your rig has the water line into the tanks so you can work from the outside.
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Old 08-14-2006, 05:45 PM   #8
Retird2Golf
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NEVER NEVER, run without water in the tanks. Heat will dry any solids

and ALWAYS seems to wind up on the sensors. When you have full

hook ups always keep the black closed so the liquids will help keep the

solids soft. Limit the amount of TP. We find that SINGLE PLY dissolves

better than "so-called" RV tissue. Add a few gallons of water and your

chemical and "head down the road". Not a perfect cure, but it helps.

Best Regards, Clyde
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Old 08-16-2006, 08:36 PM   #9
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My tanks are also 40 gals. US. My sensors also fail to be accurate, but I know that is not at all unusual. My bathroom sink is connected to the black tank but not the kitchen sink. I routinely get 5-7 days when dry camping and we do that a lot. It is indeed odd that your kitchen sink is connected to the black tank. The black tank flush system really helps to keep the black tank sensors working okay.
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Old 08-16-2006, 08:51 PM   #10
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According to FMCA the black tank cannot be connected to the grey water drains for the RV Manufacture to conform to RV Codes and Standards.
I have not found out whether these are the RVIA codes or what.

But I will continue to search for the RV Codes and Standards that were referenced by FMCA.

Ron
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