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Old 05-17-2016, 10:26 PM   #11
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Believe there are 3 vents on roof...small black chili bowl thing?

Checked after breakfast and had about a pint of grey water one heck of a vacuum. Drove another 200 miles, vacuum no water.

Stopped in at camping world here in Vegas and bought end cap with hose attachment. Will loosen hose cap and see if vacuum and grey water return. Will post results when I begin trip back next week.

Thanks to all.
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Old 05-17-2016, 10:55 PM   #12
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I guess I am somewhat baffled by this thread.
Reading it sounds like the cap on the gray water tank is held on very tight and once removed, the vacuum is so strong that it is actually holding many gallons of water in the tanks, even with the drain valve open. Like holding your finger over a straw.
Am I understanding this correctly? Is there some reason that this monster vacuum would not simply pull the water from the traps in the various sinks?
Feel free to clarify and/or explain the physics of this problem.
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Old 05-17-2016, 11:49 PM   #13
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Quote:
Originally Posted by DanNJanice View Post
I guess I am somewhat baffled by this thread.
Reading it sounds like the cap on the gray water tank is held on very tight and once removed, the vacuum is so strong that it is actually holding many gallons of water in the tanks, even with the drain valve open. Like holding your finger over a straw.
Am I understanding this correctly? Is there some reason that this monster vacuum would not simply pull the water from the traps in the various sinks?
Feel free to clarify and/or explain the physics of this problem.
3 tanks 1 black 2 grey

3 drain valves

3 drain pipes into 1 drain pipe

3 Valves are closed for travel

Main drain is capped for travel

In travel mode the drain side only develops a strong vacuum that appears to pull grey water past the kitchen valve

Main drain cap difficult to remove due to negative pressure suck, open and anywhere from a pint to a quart of grey blows out

?? Where does the suction come from...it's on the drain side of the tanks, between the tank drain valve and the outlet cap? Why, how?
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Old 05-29-2016, 07:34 AM   #14
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Any updates on this issue? When I arrived at my campsite Thursday, after only a 1 hour tow, I opened my drain cap to install the hose & about a quart of water came out. 1st time it's happen to me.

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Old 05-29-2016, 07:49 AM   #15
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Depending on the unit the pipe from the GW valve to the sewer connection can be over 8ft long. If it has any kind of a dip which holds water, after bouncing down the road, that water will be at the cap.

I have that on our Pinnacle and I have caps with the garden hose connection and open that first while holding the sewer hose under it.
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Old 05-29-2016, 08:00 AM   #16
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Man some strange things happening!
I agree w/ Grumpy that hopefully it's just a low point problem allow the leftovers to get to the opening.

Never had that problem or even heard of it.
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Old 05-29-2016, 09:36 AM   #17
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I'm wondering if leaving the cap off would stop this while traveling? I don't see an issue, as long as all tanks are drained before leaving. I guess you could strap of cap off using some Velcro until you get to your next site.

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Old 05-29-2016, 10:20 AM   #18
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Update!

We are going into week 3 on the road. The amount of gw seems to decrease as you let it out, but then I also usually dump tanks before I leave. I buy an end cap with the hose connection and drov with that loose thinking that no suction no gw...wrong! So now I travel with the hose cap off and let the pint of gw just drip out. I personally don't like that but see no other solution and its better than rolling into camp and dropping it on the ground there.

My guess is this will never get resolved. I expect my dealer and Jayco will do little.
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Old 05-29-2016, 10:21 AM   #19
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I always have at least a pint of grey in my pipe when I pull the cap off ... if it was black tank water I would be more concerned lol
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Old 05-29-2016, 11:24 AM   #20
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Quote:
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I always have at least a pint of grey in my pipe when I pull the cap off ... if it was black tank water I would be more concerned lol
That is my worry, it the black tank leakage next?
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