Good Sam Club Open Roads Forum: Tech Issues: Gray tank venting problem
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 > Gray tank venting problem

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Terry78

Oregon

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Posted: 01/20/19 10:52pm Link  |  Quote  |  Print  |  Notify Moderator

Vapor lock?

Dusty R

Charlotte Michigan 48813

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Posted: 01/21/19 05:43am Link  |  Quote  |  Print  |  Notify Moderator

Bobbo wrote:

If that was the problem, I would think that when you dump the grey tank, there would be enough suction to suck the water out of the p-trap.

Rig a collar sealing the top of the roof vent with an air compressor hose inserted. WITH THE DRAIN VALVE OPEN turn on the compressor and blow out the vent like you would blow out water lines to winterize.


I agree except, I would use the output of a shop vac instead of an air compressor.

stevenal

Newport, OR, USA

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Posted: 01/24/19 09:00am Link  |  Quote  |  Print  |  Notify Moderator

Is the low point accessible? If so, I would consider drilling a drain in it and plugging it with a screw. Also make sure you have a decent vent cover to keep rain water from entering the trap.


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starcraft69

northern California(State Of Jefferson)

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Posted: 01/24/19 09:17am Link  |  Quote  |  Print  |  Notify Moderator

Any update ??????


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olympicman

Springfield, Oregon

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Posted: 01/24/19 10:40am Link  |  Quote  |  Print  |  Notify Moderator

Update 1/24/2019,
Yes low point is accessable, so I am going to drill a hole for it to drain and plug with a screw. I will update later today how that works.
I am also looking into installing the SeeLevel gauges to better monitor tank levels, bt that will have to wait until I get home to Oregon in March where I have all my tools.


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olympicman

Springfield, Oregon

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Posted: 01/25/19 12:52pm Link  |  Quote  |  Print  |  Notify Moderator

Final update,
Drilled small hole and drained out the stinky water in low point of the vent pipe. I filled both kitchen sinks with 4 and 8 gallons of water and pulled plug on both at same time, no backup into shower and no stink. Problem solved. I also put a screw in to plug the hole I drilled.

Harvard

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Posted: 01/25/19 01:44pm Link  |  Quote  |  Print  |  Notify Moderator

Bobbo wrote:

If that was the problem, I would think that when you dump the grey tank, there would be enough suction to suck the water out of the p-trap. ....


I believe there are multiple (4?) p-traps in parallel, the one(s) with the least resistance would give way in this manner.

77rollalong

Brighton Ontario

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Posted: 01/25/19 03:17pm Link  |  Quote  |  Print  |  Notify Moderator

olympicman wrote:

Yes I have ran a hose down the vent and ran water with dump valve both open and closed probably 20 to 30 gallons. If you look at my drawing you can see that the vent pipe does not drop straight down into the tank, but drops down from top of tank before going up to the roof top. The full wall slide makes the pipe configuration nessesary.


if you could some how drill a hole into that vent pipe to put a drain tube to let out any liquid that could build up in it drain out under the motorhome, not a good design at all
, as it is the tank builds pressure...

enblethen

Moses Lake, WA

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Posted: 01/27/19 07:14pm Link  |  Quote  |  Print  |  Notify Moderator

I was thinking that you may want to put some drain cleaner down the vent into the trap. It could clean the pipe so it will not clog. Maybe leave it in overnight and then flush it out.
Make sure it is good for plastic pipe.


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Travelin2

SW Florida

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Posted: 01/28/19 08:15am Link  |  Quote  |  Print  |  Notify Moderator

http://www.buspartsexperts.com/KAZOO-DRAIN-VALVE-1_p_1195.html
If you connect a small drain pipe or hose fitting where you put that screw hole and install a duckbill valve on the end of it will take care of releasing any accumulated water without needing your attention. These can be found in many different sizes and types for many different applications....

http://www.buspartsexperts.com/KAZOO-DRAIN-VALVE-1_p_1195.html


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