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Old 09-21-2017, 05:43 AM   #1
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Sewer smell in front cab

A week and half after our PDI ... while driving we noticed a sewer smell from the front of cab. At first we thought it was the vehicle ahead of us but it lasted for some miles. Next days same smell we thought okay maybe the river. Next day same but this time we are parked. Does anyone know what that is.?
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Old 09-21-2017, 06:07 AM   #2
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I had the same problem and fixed it by putting plumbers putty around the drain pipe of the washing machine. You can also put some chemical in the grey water tank.
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Old 09-21-2017, 06:19 AM   #3
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Check to be sure the drain hose is shorter than the P trap, if not cut it to be a few inches above. Also the air admittance valve, available at Lowe's, do stick causing sewer gasses back into the coach.
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Old 09-21-2017, 08:50 AM   #4
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We got sewer smell once in a while. Complaint for our PDI where they suggested the sink P-traps emptied during turns. Now when we smell it we simply run water in all the sinks and it goes away.
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Old 09-21-2017, 09:06 AM   #5
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While at our June PDI I mentioned the smell, while driving, to the tecs. They said they checked the valves which were ok but found two p-traps that were loose. I don't understand how they could be loose w/o leaking? However, they fixed it. Zero odor smell in 2,400 miles since.

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Old 09-21-2017, 10:46 AM   #6
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Quote:
Originally Posted by KlevSuz View Post
A week and half after our PDI ... while driving we noticed a sewer smell from the front of cab. At first we thought it was the vehicle ahead of us but it lasted for some miles. Next days same smell we thought okay maybe the river. Next day same but this time we are parked. Does anyone know what that is.?
Our studor vent was not on underneath the kitchen sink
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Old 09-21-2017, 06:59 PM   #7
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I had the sewer smell while in storage...bad. It was the air admittance vent under the 1/2 bath sink. The factory valves are not the best valves as mine was brand new. I replaced all the sink vents with Studor brand sold at Lowe's. Expensive, but worth the cost.

https://www.lowes.com/pd/Studor-1-1-...e-Vent/1081741
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Old 09-21-2017, 07:06 PM   #8
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Thank you all for, the responses, but the smell seems to be coming from the AC vents not the peet traps or sinks. It only smells when the AC is on or vent is open.
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Old 09-21-2017, 07:06 PM   #9
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I remedied the problem by installing a cyclone sewer vent cap. Easy to install, but at first it squeaked when it moved. Silicone spray fixed the squeak. You can get them at Walmart or Camping World.

https://www.amazon.com/Camco-40595-W.../dp/B003P64XU4
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Old 09-21-2017, 07:14 PM   #10
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Quote:
Originally Posted by brobox View Post
Check to be sure the drain hose is shorter than the P trap, if not cut it to be a few inches above. Also the air admittance valve, available at Lowe's, do stick causing sewer gasses back into the coach.

Definitely check this item. It was checked off as "completed" on a tic list od problems when we received the coach. So.....I wrote it off as a done deal.

After smelling sewer at random and occasional conditions I reached over the top of the washer and started pulling the washer drain hose out of the standpipe it was routed to. I think it was long enough to go thru the trap and all the way to the gray tank.

Mark the hose with a magic marker where it enters the standpipe and start pulling it out. When you find it is long enough to easily reach the trap just cut the hos off 4 inches past the mark you made. Reinstall it and wrap the connection with plumbers putty.

Our washer drain hose was sealed to the standpipe with some sort of gum or something so I figured it had been addressed. Sealing it with plumbers putty is important but having the drain pipe the proper length is mandatory.
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Old 09-21-2017, 07:18 PM   #11
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Thanks where do I find this vent under the sink?
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Old 09-21-2017, 07:22 PM   #12
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Quote:
Originally Posted by KlevSuz View Post
Thank you all for, the responses, but the smell seems to be coming from the AC vents not the peet traps or sinks. It only smells when the AC is on or vent is open.
A/C's and vents move air, I have never known of one to give off a sewer smell. It might be that the A/C is pulling the sewer smell from the source.

If you are returning from your PDI, that would indicate that your coach in in the 2 year old range. If you have not had the smell before, I would think it is one of the air admittance valves. It is a common problem with RV's

https://www.google.com/search?q=RV+A...utf-8&oe=utf-8
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Old 09-21-2017, 07:36 PM   #13
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If your smell is coming from the dash AC get a can of Lysol spray. Slide out the generator and with the AC on medium fan speed and set for outside air circulation, spray a liberal dose of Lysol into the air intake located above the generator. You can feel the air being drawn into the rectangular hole on the evaporator box. It works best to let it soak overnight. It may take more than one treatment. I also sprayed the ducts from inside the coach while the fan was off.

Mine was smelly the first day driving after delivery. After two treatment, no more smell to date.
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Old 09-21-2017, 07:43 PM   #14
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If it really is coming from your a/c's you might want to read up on what's called dirty sock syndrome. The fix for it is sanitizing your evap coil. Sometimes that's a permanent fix, sometimes not.
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