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04-23-2017, 01:55 PM
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#1
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Senior Member
Join Date: Apr 2016
Location: Virginia Beach
Posts: 195
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Draining the grey tank...
When I dump the grey, I start slow and eventually have the valve fully open... it gushes full flow for a little while then slows and almost stops...
Then suddenly gushes full flow for another second or two...
This is my 3rd Motorhome, and the first time I've ever seen this phenomenon...
Could I have a problem???
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04-23-2017, 01:57 PM
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#2
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Senior Member
Join Date: Apr 2017
Posts: 257
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It does this every time?
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04-23-2017, 02:00 PM
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#3
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Senior Member
Join Date: Apr 2016
Location: Virginia Beach
Posts: 195
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It seems every time I dump from full...
1/2 or less, I don't seem to notice but will have to pay attention to...
__________________
- 2017 Coachmen Mirada 35LS - Class A Gasser
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04-23-2017, 02:00 PM
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#4
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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Vent is partly or completely blocked.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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04-23-2017, 02:01 PM
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#5
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,780
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I've never had that happen. 
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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04-23-2017, 02:01 PM
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#6
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Senior Member
Join Date: Dec 2014
Location: High up in Arizona
Posts: 2,050
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Mine does similar things with gray. I think it comes out so fast that it causes a back up or vapor type of lock. I just open valve half way at first and when it starts to slow I open it up all the way, no problems.
__________________
2019 Allegro Bus 37AP towing a Jeep JK Rubicon Wrangler
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04-23-2017, 02:01 PM
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#7
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Senior Member
Join Date: Apr 2016
Location: Virginia Beach
Posts: 195
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I was thinking tank vent... but didn't seem likely with new rig...
__________________
- 2017 Coachmen Mirada 35LS - Class A Gasser
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04-23-2017, 02:06 PM
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#8
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Senior Member
Monaco Owners Club
Join Date: Dec 2010
Location: Rochester, WA
Posts: 128
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Our MH has the same issue.
I thought it was plugged because we had water backing up into to shower last year. Finally it went through this draining, stopping, and draining then it worked fine the rest of last season.
Took it out this year and noticed the draining, stopping and draining again. But it didn't back up in the shower.
I assume these holding tanks have vent pipes. Maybe that is being restricted somehow. Just had that thought. Maybe I'll go check.
Looking forward to more thoughts.
__________________
Bill & Gabrielle - 1999 Monaco Diplomat 38A
Previous: B&I Circus Tent, 1951 Montgomery Ward Tent Trailer, 1976 Holiday Imperial Class C, 1994 Wilderness Trailer
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04-23-2017, 02:40 PM
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#9
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Senior Member
Tiffin Owners Club
Join Date: Nov 2011
Location: Foley, AL
Posts: 1,093
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Definitely sounds like restricted vent. Like pouring a full gallon jug of water out only bigger, glug, glug, glug.
__________________
Les & Pam Warden
(Tiffin) 2017 Phaeton 40QBH; 2023 Wayfarer 25RW (coming soon)
2016 Jeep JKUS with Ready Brute Elite towbar
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04-25-2017, 01:34 PM
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#10
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Senior Member
National RV Owners Club Workhorse Chassis Owner
Join Date: May 2000
Location: California Central Coast
Posts: 2,034
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Don't all the drains that drain into the gray tank act as a vent system? None of them are shut off from the tank. It seems all would have to have blockage to block venting.
Glenn
__________________
2006 Sea Breeze LX 8341 on a Workhorse W22 Chassis with 22.5 Alcoa Alum wheels,
2011 Chevy Colorado 4X4 with Ready Brake
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04-25-2017, 02:55 PM
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#11
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,514
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Quote:
Originally Posted by Glenn and Kathy
Don't all the drains that drain into the gray tank act as a vent system? None of them are shut off from the tank. It seems all would have to have blockage to block venting.
Glenn
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If the drains are equipped with an inline trap, they would not vent the tank.
__________________
Dieselclacker
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04-25-2017, 03:03 PM
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#12
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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I have seen similar to some extend occationally on multiple motorhomes I've had. I think maybe the water at times can come out faster than vent can vent air in. I've never worried about it.
__________________
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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04-26-2017, 09:10 AM
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#13
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Senior Member
Monaco Owners Club
Join Date: Jan 2008
Location: Olympia, Wa
Posts: 2,772
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HAVE seen the same. Would bet the vent pipe is pushed too deep into the gray tank or not in the high end.
LEN
__________________
2004 Clss C 31' Winnebgo
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