RV.Net Open Roads Forum: Tech Issues: Gray Tank Smell (Seriously annoying)

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > Gray Tank Smell (Seriously annoying)

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 5  
Prev  |  Next
Sponsored By:
ernie1

Sacramento,California,USA

Senior Member

Joined: 02/10/2004

View Profile



Good Sam RV Club Member


Posted: 07/14/22 01:11pm Link  |  Quote  |  Print  |  Notify Moderator

Make doubly sure the traps under your sinks have enough water in them to form a seal that will not allow sewer gases back into the coach. I had that problem in the past where after traveling for a bit of time or after having just dumped the gray tank waste which might siphon out the trap, I would get a foul odor from the gray water tank. Nowadays, I try to remember to screw down tightly the sink drain plug which prevents the loss of liquid in the trap.

Latner

Indiana

Senior Member

Joined: 08/06/2006

View Profile



Posted: 07/14/22 02:12pm Link  |  Quote  |  Print  |  Notify Moderator

ernie1 wrote:

Make doubly sure the traps under your sinks have enough water in them to form a seal that will not allow sewer gases back into the coach. I had that problem in the past where after traveling for a bit of time or after having just dumped the gray tank waste which might siphon out the trap, I would get a foul odor from the gray water tank. Nowadays, I try to remember to screw down tightly the sink drain plug which prevents the loss of liquid in the trap.


X2 I always run water into the traps for this reason.

JimK-NY

NY

Senior Member

Joined: 05/12/2010

View Profile



Good Sam RV Club Member

Offline
Posted: 07/14/22 02:59pm Link  |  Quote  |  Print  |  Notify Moderator

I had a similar issue many years ago except it had nothing to do with the A/C. Traps seemed Ok with water in them but the stench from the gray water tank was intense. Two steps have helped to minimize/eliminate the problem. First we got fine mesh stainless steel traps for the kitchen sink. That helps to keep all but small food particles out of the gray water. Next I bleach the tank fairly frequently. I add about a cup of bleach to the tank every few weeks. I have even rinsed out the tank by first filling the tank with a hose and then letting it empty completely.

agesilaus

North Florida

Senior Member

Joined: 05/06/2008

View Profile



Good Sam RV Club Member

Offline
Posted: 07/14/22 04:46pm Link  |  Quote  |  Print  |  Notify Moderator

bukhrn wrote:

You mentioned that you get the smell with the AC running, do you get the same smell from the sink area Without
the AC on?


Not as noticeable, but it is there.


Arctic Fox 25Y Travel Trailer
2018 RAM 2500 6.7L 4WD shortbed
Straightline dual cam hitch
400W Solar with Victron controller
Superbumper


Wulrich

Texas

New Member

Joined: 07/14/2022

View Profile


Offline
Posted: 07/14/22 04:55pm Link  |  Quote  |  Print  |  Notify Moderator

ernie1 wrote:

Make doubly sure the traps under your sinks have enough water in them to form a seal that will not allow sewer gases back into the coach. I had that problem in the past where after traveling for a bit of time or after having just dumped the gray tank waste which might siphon out the trap, I would get a foul odor from the gray water tank. Nowadays, I try to remember to screw down tightly the sink drain plug which prevents the loss of liquid in the trap.



I’ve checked the p-traps, they were good.

And I don’t get the smell if the ac’s are off at all.

Lantley

Ellicott City, Maryland

Senior Member

Joined: 08/23/2005

View Profile


Offline
Posted: 07/14/22 09:13pm Link  |  Quote  |  Print  |  Notify Moderator

Dave in TN wrote:

This product worked for me when we encountered grey tank odor issues. Of course if your problem isn't tank related this wouldn't help.

https://www.amazon.com/Camco-40597-Black-Cyclone-Plumbing/dp/B00SQ1K19A?th=1

[image]

These^^^ are fancy vent caps. As I initially mentioned the vent caps are a potential solution. I had a similar issue and resolved it with
cyclone vent caps shown above.I think without the proper cap the odor lingers at the roof line, maybe it even infiltrates below the roof line and into the attic space. Running the A/C circulates this foul air into the living space and you notice/smell the problem. Check your roof vents!


19'Duramax w/hips,12'Open Range,Titan Disc Brake
BD3,RV safepower,22" Blackstone
Ox Bedsaver,RV760 w/BC20,Glow Steps, Enduraplas25,Pedego
BakFlip,RVLock,5500 Onan LP,Prog.50A surge,Hughes autoformer
Porta Bote 8.0 Nissan,Sailun S637
Correct Trax,Splendide


opnspaces

San Diego Ca

Senior Member

Joined: 12/22/2004

View Profile


Online
Posted: 07/15/22 01:01am Link  |  Quote  |  Print  |  Notify Moderator

Wulrich wrote:


Issue: Every time we run the kitchen faucet we get a rotten egg smell out of both of our A/C units almost instantly. We’ve had the unit for about 3 months, and this has been going on for about 2 months.


Has the gray tank ever been removed? It sounds like there is a break or separation high up in the vent pipe. What I would do. First drain the gray tank so there is lots of air in the tank. Climb up on the roof with a bottle of Pine Sol and a roll of duct tape. Take the cover off the vent pipe and make sure it sticks up out of the roof and the pipe is sealed all the way around the exterior. If it is not sealed or doesn't stick up you have a potential problem.

Carefully pour about a cup of pine sol down the vent pipe but do not splash it outside the pipe. Now slap a piece of duct tape over the end of the pipe to seal it off.

Go down and start the AC and then run the kitchen sink. Does the smell come out? If it still smells shut everything off and remove the air admittance valve and slap a piece of tape over the end of the pipe. Repeat the test again. Does it still smell?

Alternatively. Leave the tank with a bunch of water in it. Go to a place that sells dry ice (in my area a few grocery stores and Baskin Robins ice cream stores sell it) Buy about 2 pounds, leave the dry ice wrapped up and take it up on the roof in a dry bucket and a hammer. Break up the ice into smaller chunks with the hammer and drop it all down the vent pipe. Give it a minute or two to really start melting and then go turn on the AC and sink. Hopefully you can see the vapor from the ice escaping where the stink is coming out.

Do you have or know anybody who has a Halloween smoke machine? Maybe you can rig it up with a 10 foot hose and run the hose down the vent pipe and into the gray tank. Now fill the tank with fog. Wait a few minutes and test for leaks.


2001 Suburban 4x4. 6.0L, 4.10 3/4 ton
2005 Jayco Jay Flight 27BH
1986 Coleman Columbia Popup.

JimK-NY

NY

Senior Member

Joined: 05/12/2010

View Profile



Good Sam RV Club Member

Offline
Posted: 07/15/22 04:28am Link  |  Quote  |  Print  |  Notify Moderator

Do I understand there are no odors unless the A/C is running? If that is the case, I don't see any connection with the grey water. I would check the A/C. Maybe a dead critter in the unit. As mentioned the A/C does not pull any outside air so the offending item would be inside in the A/C or ductwork if there is any.

Wulrich

Texas

New Member

Joined: 07/14/2022

View Profile


Offline
Posted: 07/15/22 05:45am Link  |  Quote  |  Print  |  Notify Moderator

opnspaces wrote:

Wulrich wrote:


Issue: Every time we run the kitchen faucet we get a rotten egg smell out of both of our A/C units almost instantly. We’ve had the unit for about 3 months, and this has been going on for about 2 months.


Has the gray tank ever been removed? It sounds like there is a break or separation high up in the vent pipe. What I would do. First drain the gray tank so there is lots of air in the tank. Climb up on the roof with a bottle of Pine Sol and a roll of duct tape. Take the cover off the vent pipe and make sure it sticks up out of the roof and the pipe is sealed all the way around the exterior. If it is not sealed or doesn't stick up you have a potential problem.

Carefully pour about a cup of pine sol down the vent pipe but do not splash it outside the pipe. Now slap a piece of duct tape over the end of the pipe to seal it off.

Go down and start the AC and then run the kitchen sink. Does the smell come out? If it still smells shut everything off and remove the air admittance valve and slap a piece of tape over the end of the pipe. Repeat the test again. Does it still smell?

Alternatively. Leave the tank with a bunch of water in it. Go to a place that sells dry ice (in my area a few grocery stores and Baskin Robins ice cream stores sell it) Buy about 2 pounds, leave the dry ice wrapped up and take it up on the roof in a dry bucket and a hammer. Break up the ice into smaller chunks with the hammer and drop it all down the vent pipe. Give it a minute or two to really start melting and then go turn on the AC and sink. Hopefully you can see the vapor from the ice escaping where the stink is coming out.

Do you have or know anybody who has a Halloween smoke machine? Maybe you can rig it up with a 10 foot hose and run the hose down the vent pipe and into the gray tank. Now fill the tank with fog. Wait a few minutes and test for leaks.


Let me try all of these this weekend, those are good ideas. I called the company that makes my air admittance valves and they are sending free replacements as well.

Wulrich

Texas

New Member

Joined: 07/14/2022

View Profile


Offline
Posted: 07/15/22 05:46am Link  |  Quote  |  Print  |  Notify Moderator

JimK-NY wrote:

Do I understand there are no odors unless the A/C is running? If that is the case, I don't see any connection with the grey water. I would check the A/C. Maybe a dead critter in the unit. As mentioned the A/C does not pull any outside air so the offending item would be inside in the A/C or ductwork if there is any.


No odors unless the A/C is running. The A/C smells perfectly fine unless I’m running the kitchen faucet, so it’s hard to believe that there is something inside the unit that is making it stink. But I will check

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 5  
Prev  |  Next

Open Roads Forum  >  Tech Issues

 > Gray Tank Smell (Seriously annoying)
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:




© 2023 CWI, Inc. © 2023 Good Sam Enterprises, LLC. All Rights Reserved.