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Old 09-07-2013, 06:14 AM   #1
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smell only while driving?

I have a 2005 endeavour.While camping there are no smells.I cannot dump where I camp so I have to drive with full tanks.Problem is with all the windows closed there is no smell.As soon as we open either of the front windows it starts to stink in the rv.If I go into the bathroom that is the only place it doesn't smell.If we shut the windows the smell slowly goes away.Makes no sense to me.Any ideas?Thanks
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Old 09-07-2013, 06:23 AM   #2
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You're probably smelling the grey tank which can be equally as bad as the black tank. The fumes are being sucked up through the sink drains. We plug up all the sinks if we travel with anything in the tanks. If you do , be sure to turn off the water pump.
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Old 09-07-2013, 09:30 AM   #3
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Along with Clifftall's advice...if you have a washer, that trap needs to have water in it too.

Also, on top of your rig there are two dome shaped vent covers. These restrictions allow a positive pressure to develop (it should be negative pressure) when an air stream flows over them while driving. Opening a window in the rig causes a negative pressure inside the RV which draws the foul air into the RV.

The cure, generally, is to replace those domes with plastic 'T's found in the bathroom repair section of Home Depot. $6 or so for two. Or you can pay $70 for the fancy devices available at RV stores or online.
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Old 09-07-2013, 10:03 AM   #4
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If we travel with the rear-most roof vent open we get sewer smell as the windows vent out and air is sucked in through the roof vent. It is near the roof sewer vent. If we use only the front roof vent we have no smelly problem.
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Old 09-07-2013, 10:20 AM   #5
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We have to keep all our roof vents closed while moving or we get smell.
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Old 09-07-2013, 06:15 PM   #6
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You can put stoppers in the drains, but you can also make sure there is water in the p-traps.

If I put a little water in mine it stops. Often if you drain a sink that is full the suction of the water going down will pull all the water through the p-trap.

The smell is really sickening.
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Old 09-07-2013, 06:20 PM   #7
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Quote:
Originally Posted by Jim_HiTek View Post
Along with Clifftall's advice...if you have a washer, that trap needs to have water in it too.

Also, on top of your rig there are two dome shaped vent covers. These restrictions allow a positive pressure to develop (it should be negative pressure) when an air stream flows over them while driving. Opening a window in the rig causes a negative pressure inside the RV which draws the foul air into the RV.

The cure, generally, is to replace those domes with plastic 'T's found in the bathroom repair section of Home Depot. $6 or so for two. Or you can pay $70 for the fancy devices available at RV stores or online.
I assume the "Ts" should be installed so air does not flow directly through them (opened to sides of MH rather than with length of MH)?
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Old 09-08-2013, 12:32 AM   #8
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I assume the "Ts" should be installed so air does not flow directly through them (opened to sides of MH rather than with length of MH)?
Doubt that it matters. I put mine front to rear (length of MH) so air would flow though them nicely to draw better while driving. They are such a small target that if you're worried about rain getting in them and filling your tank in a rain storm, fergetaboutit.

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Old 09-09-2013, 09:54 AM   #9
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This place is great.Thanks everyone.
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Old 09-09-2013, 10:04 AM   #10
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https://360productsnorthamerica.com/site/

I have one on my black and one on my grey. No smells when travelling now.
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Old 09-09-2013, 10:06 AM   #11
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Quote:
Originally Posted by Arch Hoagland View Post
We have to keep all our roof vents closed while moving or we get smell.
Driving with the dash heat/air/vent fan on, (not set to recirculate), creates a positive pressure on the cabin of the coach... (positive pressure prevents tank stink leakage into the living space).
BTW, if every drain trap, mechanical drain vent and the toilet seals are working properly it's imposable for tank odor to get into the coach.
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Old 09-09-2013, 05:10 PM   #12
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Don't forget to check the Anti-siphoning Valves located near the P Traps (Sinks, Washer drain), etc. After time, the rubber seal may not seal correctly after opening to allow air when draining grey water sinks, washer,etc. Yep, grey tank odors can be very nasty. I replaced all 3 of mine (Lowes/Home depot) and put the Xtreme Vent product on roof vent from Coil N Wrap to improve the venturi effect of roof vent (I only have 1). No more grey or black tank odors no matter if windows/vents are open or closed.
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Old 09-09-2013, 05:57 PM   #13
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Don't forget to check the Anti-siphoning Valves located near the P Traps (Sinks, Washer drain), etc. After time, the rubber seal may not seal correctly after opening to allow air when draining grey water sinks, washer,etc. Yep, grey tank odors can be very nasty. I replaced all 3 of mine (Lowes/Home depot).
No more grey or black tank odors no matter if windows/vents are open or closed.
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There are no "Anti-siphoning Valves" in a RV drain/sewer system.
What you are talking about are Mechanical Plumbing Vents, like these:
Mechanical Plumbing Vent on eBay!
AKA: Air Admittance Valves.
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Old 09-09-2013, 07:11 PM   #14
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We get that also., I've been told to get a rv vent cap, like this :
Cyclone Sewer Vent - Camco 40595 - Vents - Camping World
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