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Old 04-30-2015, 03:49 PM   #11
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No Rick, both tank valves were open, only the exit valve was closed. Some waste water did back up into the grey tank but a majority leaked.


I can only assume that the pressure is causing leaks due to water trying to run up hill.


Ken
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Old 04-30-2015, 04:12 PM   #12
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Originally Posted by brenkco View Post
No Rick, both tank valves were open, only the exit valve was closed. Some waste water did back up into the grey tank but a majority leaked.


I can only assume that the pressure is causing leaks due to water trying to run up hill.


Ken
Ok Ken, I give up. Maybe someone else on this forum may have suggestions. Again, I know your frustration in not being able to utilize the total 90 gallons when you need it. That extra 45 gallons can make the difference in dumping every other day to once every 5 or 6 days.
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Old 04-30-2015, 04:22 PM   #13
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Thanks for your thoughts, Rick.


I have tried a few posts some time ago on this and the other forum. Not sure that there is much else that can be done...kinda one of those oh well.....and live with it!!


Ken
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Old 04-30-2015, 08:03 PM   #14
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In reading through this whole string the only thing that I can think of given everyone's great input is that there is a joint that is not completely sealed between the two gate/knife valves.

Normally the stretch of drain pipe between the gate/knife valve does not have to hold water... the drain water runs through it but it does not hold water for any real period of time... When we add another valve at the end to make use of both holding tanks we now have more pipe that must be waterproof / sealed completely...

The kicker to all of this is finding where that one(?) spot might be that needs to be completely sealed... I am not sure I would ever consider undertaking that task given what is involved in gaining visibility to those underbelly areas... And I am not sure that all dealers would voluntarily do this work when we are using this system beyond its intended purpose...

Don't get me wrong, I think the manuafacuturer should have ensured that all joints were completely sealed; but I am also confident that they would not have added another gate/knife valve to test those seams below the original valves.

At some point we all have to determine whether the juice is worth the squeeze.

Happy Travels,

Bill n Diana
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Old 04-30-2015, 10:42 PM   #15
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Ditto, Bill must have read my mind (a really short story) and beat me to the post.
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Old 05-01-2015, 01:43 AM   #16
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And I am not sure that all dealers would voluntarily do this work when we are using this system beyond its intended purpose...

Bill n Diana
Bill,

This we can agree on as I tried. Truly beyond it's intended purpose! However, I have disproven your theory about the two valves. I regularly open both the grey tank valves and just use the secondary valve to dump the tanks when parked for a while.....no leaks whatsoever. Therefore, one can conclude that the drains from the factory valves to the secondary exit valve is secure.

I am currently traveling with a bunch of Montana owners, some of which have the old style frames where the tanks are mounted at the same horizontal level. The tanks equalize perfectly.

The consensus of this group is that drain pipes are not intended to take pressure. The full lower tank combined with the upper tank creating gravity feed pressure applies enough force not contemplated by the drains. I still suspect that it is probably the spin weld on the vent pipe of the galley tank......

But as you eloquently said,

Quote:
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At some point we all have to determine whether the juice is worth the squeeze.


Bill n Diana
Thanks for your feed back and assist!

Ken
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Old 05-01-2015, 12:34 PM   #17
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Ken,

While I thought there might be two different levels the tanks sat I didn't know as my 38FL has all the tanks at a single level...

As Sheldon Cooper once said, "Gravity..., thou art a heartless biotch..."

Happy Travels.

Bill n Diana
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Old 05-01-2015, 04:42 PM   #18
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Ken,
I would agree, it sounds like the vent collar - those are not very tight secure connections, and probably not worth pushing your luck. I think the collar is just glued on the tank.


Everything is a trade off on RV design and features for sure.
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