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Old 05-16-2016, 11:02 PM   #1
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The saga continues or It sucks!

Well my first thought it was a leaking valve on our month old fw and yes it does appear to be leaking from the kitchen grey tank. I have 3 tanks, black and 2 greys.

BUT less not blame it on the valve, that is the result Not the problem! The origin is a suction on the drain pipe between the valve and the outlet. It sucks! Where in the world is the suction coming from???

The suction occurs with or without empty tanks. The suction is enough to makes removing the outlet cover difficult to remove.

On a 3 week trip and am getting about a gallon of grey when I remove the outlet cover.

????
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Old 05-16-2016, 11:18 PM   #2
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That is weird...never heard of that before. You shouldn't have negative pressure in any of your tanks or drain lines. If anything, they should be pressure neutral due to the tank vents. I guess I could theoretically see where the vents are closed or blocked and pressure was building up in the tanks. Water would be at the bottom, and the trapped air would compress to the point where it would actually force the water out of the bottom of the tank into the drain lines.

Do you have vent stacks in the roof (one per tank), or do you have one of those new "air admittance valves"?

Negative pressure and positive pressure would both exert enough force on your drain cap to make it hard to open. Until you get it figured out, you may want to pick up one of those caps with the water hose connection on it...and carry a bucket to catch what comes out.
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Old 05-16-2016, 11:37 PM   #3
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Quote:
Originally Posted by justman View Post
That is weird...never heard of that before. You shouldn't have negative pressure in any of your tanks or drain lines. If anything, they should be pressure neutral due to the tank vents. I guess I could theoretically see where the vents are closed or blocked and pressure was building up in the tanks. Water would be at the bottom, and the trapped air would compress to the point where it would actually force the water out of the bottom of the tank into the drain lines.

Do you have vent stacks in the roof (one per tank), or do you have one of those new "air admittance valves"?

Negative pressure and positive pressure would both exert enough force on your drain cap to make it hard to open. Until you get it figured out, you may want to pick up one of those caps with the water hose connection on it...and carry a bucket to catch what comes out.
WEIRD is right!

I don't have any vent stacks on the roof, I do have a air admittance valve on the kitchen grey tank side. The valve is about 18 in from the sink drain. Which is an open drain. That said should make no diff as the suction is on the other side of the valve. If anything the tank side would generate gas causing a positive pressure.

Am really stumped...
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Old 05-17-2016, 06:42 AM   #4
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WEIRD is right!

I don't have any vent stacks on the roof, I do have a air admittance valve on the kitchen grey tank side. The valve is about 18 in from the sink drain. Which is an open drain. That said should make no diff as the suction is on the other side of the valve. If anything the tank side would generate gas causing a positive pressure.

Am really stumped...
Don, your saying on your roof there are No Vent stacks? I only have 1 bathroom, but I think I have 3 vents on my roof!

Dave...
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Old 05-17-2016, 06:49 AM   #5
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My pipe cap is hard to turn but comes right off. I do get a few drops of water but I did on previous campers also.
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Old 05-17-2016, 08:07 AM   #6
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Well my first thought it was a leaking valve on our month old fw and yes it does appear to be leaking from the kitchen grey tank. I have 3 tanks, black and 2 greys.

BUT less not blame it on the valve, that is the result Not the problem! The origin is a suction on the drain pipe between the valve and the outlet. It sucks! Where in the world is the suction coming from???

The suction occurs with or without empty tanks. The suction is enough to makes removing the outlet cover difficult to remove.

On a 3 week trip and am getting about a gallon of grey when I remove the outlet cover.

????
I am fighting this exact same issue on my 2015 345BHTS. I have had it to the dealer once and they told me they replaced the valves and can't reproduce my problem. I did notice last week on my outdoor kitchen grey tank that I had to literally wrestle the cap off and when I pulled the valve nothing came out. I accidentally left the valve and cap off and hooked to my main front valve ( I have 3 for some reason:scratched: ) pulled the front black and water came rushing out the back grey valve. I have taken pictures and videos of this as when I undo my main valve water comes pouring out. This is getting really frustrating for me as I took it to them last fall and they had the unit for 3 months and assured me they fixed this issue.
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Old 05-17-2016, 08:43 AM   #7
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If you have washer/dryer prep you probably have a seperate grey tank for that.
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Old 05-17-2016, 10:07 AM   #8
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I had this problem in my previous 5er (not a Jayco) and had to travel with one of the roof vents open in order to relieve the pressure. Otherwise it would pull water out of the drain lines into the sinks.
The other issue of a gallon of water coming out of the drain line after the cap is removed can be resolved by installing one of these:
http://www.amazon.com/Valterra-T58-T...shut+off+valve
I hope I understand your problems correctly.
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Old 05-17-2016, 11:48 AM   #9
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All, will get on roof after breakfast and look for roof vents, there is one under kitch sink.

No on washer dryer prep.

All 3 waste tanks drain to central pipe.

Def a suction, seems to be only while driving. Have drove about 30 min on highway this am. Will check, post laters.

Right now just standing on a corner in Winslow AZ...Vegas today.
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Old 05-17-2016, 12:37 PM   #10
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If it's a suction, it may also be due to the thermal expansion and contraction of the tanks. If the tanks get hot, the air will expand and expand the tanks. When the tanks cool, the air inside will condense and create a vacuum.

I don't know if that's what's happening, but I suspect it's because of the fancy plumbing being put in rigs these days---specifically the air admittance valve. They're nice for not having to put a vent pipe through the roof, but's that's about it. They're mechanical and need to be replaced when they fail. Of course, they're also in the most convenient location to do so.

The easiest solution is probably what Troutslayer pushed your way--a separate add-on valve at the end of your drain line. I use one just like it.
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