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Old 06-01-2016, 06:55 AM   #1
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black tank valve issue 29.5

So this last weekend was our 3rd time out with the new camper and the first 2 times draining the tanks I thought it was a fluke but not so much now. I know I had the tanks completely drained when we went up and started camping and after 5 days we made our way back home and stopped at our local rv drain spot. I know I had all the valves closed as much as they will go but when I take the cap off drain to hook up my hose there is about a half gallon or so of black water behind the cap the spills on the ground. I then hook up the hose and drain the rest of the tanks. I called my dealer and they can't get me in until the end of June. I would normally fix this myself either by looking to see what is letting water through or replacing the valve but with the enclosed underbelly I don't really want to mess with it.

Has anyone else had this happen or have any other ideas? Is it just a bad valve you think?

For the time being I picked up one of these twist on valve
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Old 06-01-2016, 07:21 AM   #2
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Originally Posted by Camping_J View Post
So this last weekend was our 3rd time out with the new camper and the first 2 times draining the tanks I thought it was a fluke but not so much now. I know I had the tanks completely drained when we went up and started camping and after 5 days we made our way back home and stopped at our local rv drain spot. I know I had all the valves closed as much as they will go but when I take the cap off drain to hook up my hose there is about a half gallon or so of black water behind the cap the spills on the ground. I then hook up the hose and drain the rest of the tanks. I called my dealer and they can't get me in until the end of June. I would normally fix this myself either by looking to see what is letting water through or replacing the valve but with the enclosed underbelly I don't really want to mess with it.

Has anyone else had this happen or have any other ideas? Is it just a bad valve you think?


For the time being I picked up one of these twist on valve
I would put my money on a piece of toilet paper caught in your valve. Have had it twice before. Unfortunately, that is not a warranty issue because it's not a defective valve. If you get the dealer to deal with it, they most likely will replace the valve. The valves are less then $20 and they won't take a chance on cleaning with all the labor it cost to get to it. I cut a window in my belly for access and replaced it myself last time. You need to come up with a better plan for dumping to ensure that a floating remnant of toilet paper doesn't float thru just as you close the valve. I have started adding powdered water softener to to black tank water to make sure everything is slicker hoping that it will help move all material thru the valve easier. Time will tell if it helps!!
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Old 06-01-2016, 07:36 AM   #3
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Yes it has happened to me 2x, about a half gallon both times. Looks like gray water in my case. I'm going to test both front gray water tanks to see if I can reproduce it again and figure out which one it is. If I can reproduce then I will probably just tackle the valve replacement myself.
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Old 06-01-2016, 07:51 AM   #4
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I would put my money on a piece of toilet paper caught in your valve. Have had it twice before. Unfortunately, that is not a warranty issue because it's not a defective valve. If you get the dealer to deal with it, they most likely will replace the valve. The valves are less then $20 and they won't take a chance on cleaning with all the labor it cost to get to it. I cut a window in my belly for access and replaced it myself last time. You need to come up with a better plan for dumping to ensure that a floating remnant of toilet paper doesn't float thru just as you close the valve. I have started adding powdered water softener to to black tank water to make sure everything is slicker hoping that it will help move all material thru the valve easier. Time will tell if it helps!!
Being that this is a new camper and we have just used it for urination (use cg bathroom for going number 2) and my wife keeps a trash can for her toilet paper so the only that has been in our black tank is liquid. So I find it hard to believe that there is anything blocking the valve. I have also rinsed out the tank with the black tank flush to ensure that there is nothing in there from construction and from when the dealer did their testing as well.
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Old 06-01-2016, 08:08 AM   #5
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Being that this is a new camper and we have just used it for urination (use cg bathroom for going number 2) and my wife keeps a trash can for her toilet paper so the only that has been in our black tank is liquid. So I find it hard to believe that there is anything blocking the valve. I have also rinsed out the tank with the black tank flush to ensure that there is nothing in there from construction and from when the dealer did their testing as well.
Just giving you my experience. I use the flush regularly but have had problems with toilet paper caught in the knife valve. If you haven't put any paper toilet or tissue down the toilet, doesn't seem that could be the issue. The twist on secondary valve is a must in my book!! Excellent back up system!!!
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Old 06-01-2016, 09:38 AM   #6
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I think this issue is rather widespread, and has something to do with the use of the vent device under the sink for the gray tank in some units, instead of venting to the roof. As mentioned the Valterra twist on valve is a good stopgap and secondary safety.
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Old 06-01-2016, 02:38 PM   #7
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We purchased a 2016 Pinnacle about two months ago, tested the tanks prior to our first trip, the black tank valve did not hold. I went in through the storage wall and was able to view all valves, both grey and black. The black valve cable was not installed correctly to the valve, the outer cable was not in the housing. They did connect the inner cable and all felt right but wasn't. Once the cable was reinstalled everything was good. I put a clear cap on my outside outlet to make sure it was holding.
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Old 06-01-2016, 02:41 PM   #8
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Another consideration is when you dumped, you were not level and some of the water between the valve and pipe outlet could not gravity feed to the end.

There is another thread on the forum about this same problem.
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Old 06-01-2016, 02:42 PM   #9
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Originally Posted by Skinner View Post
We purchased a 2016 Pinnacle about two months ago, tested the tanks prior to our first trip, the black tank valve did not hold. I went in through the storage wall and was able to view all valves, both grey and black. The black valve cable was not installed correctly to the valve, the outer cable was not in the housing. They did connect the inner cable and all felt right but wasn't. Once the cable was reinstalled everything was good. I put a clear cap on my outside outlet to make sure it was holding.
Priceless and well timed info, thank you. I will see if I can get access to the valves this way, vs. trying to go through the underbelly. The clear cap is a good idea too, best to know something is "waiting for you" so you can wear appropriate gloves lol.
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Old 06-01-2016, 02:47 PM   #10
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Quote:
Originally Posted by Skinner View Post
We purchased a 2016 Pinnacle about two months ago, tested the tanks prior to our first trip, the black tank valve did not hold. I went in through the storage wall and was able to view all valves, both grey and black. The black valve cable was not installed correctly to the valve, the outer cable was not in the housing. They did connect the inner cable and all felt right but wasn't. Once the cable was reinstalled everything was good. I put a clear cap on my outside outlet to make sure it was holding.
I to will look and see if I can access the valves myself this way. I do like the clear cap idea as well.
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