Home » Public Forums » GMCnet » [GMCnet] VAPOR RECOVERY VENTS
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| Re: [GMCnet] VAPOR RECOVERY VENTS [message #186333 is a reply to message #186330] |
Wed, 03 October 2012 18:35   |
Mr ERFisher
Messages: 7117
Registered: August 2005
Karma: 2
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Senior Member |
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SUCCESS
the reason we were discussing the vent issue is:
- my 26 "never had this pressure in the tank " problem
- now I have my tanks down, and never want to do it again
- J R wheeler and still has this problem after a "hard line" upgrade
- Bovee had "pressure in the tank" after driving only 5 miles, on his new 2
year old system.
in these slides I show the pictures from Rick Williams of the two vent
systems (from Emery's pdf)
*http://tinyurl.com/8kb4q8o
*part of the problem
*http://tinyurl.com/9ccc4qq*
-
So Mr. Bovee grabbed the bit, and tore into his vapor recovery system ( the
one for "pressure in the tank"
- found his "new $150" recovery valve, was blocking the vapor recovery
system
- put the OEM one back, and --wally-- no more pressure in the gas tanks
so
the question is :
--- can we take the damp thing out-----
I would like to talk to the owner who posted a couple of weeks ago -
- he had removed the canister and vapor recovery system
- I lost the link to him
- I am thinking this is a big part of the temp-pressure- blow back---
problem
- maybe we should remove the whole, thing and go to a over flow type of
system
so will the folks who have removed the vapor recovery system, send me a note
gene
On Wed, Oct 3, 2012 at 4:14 PM, gene Fisher <mr.erfisher@gmail.com> wrote:
> STARTED A NEW THREAD
>
> It seems to me we are confusing the vents
>
> in these slides I show the pictures from Rick Williams of the two vent
> systems (from Emery's pdf)
> *http://tinyurl.com/8kb4q8o
>
> it seems to me:
>
> 1 if you have a problem filling the tank it is a problem with the "sender
> vents"
>
> 2 if you have pressure in your tank(with the cap on) you have a problem in
> the "vapor recovery vents".
>
> these are 2 different functions
> is this correct?
>
> gene
> *
>
> --
> Gene Fisher -- 74-23,77PB/ore/ca
> “Give a man a fish; you have fed him for today --- give him a URL and
> -------
> http://gmcmotorhome.info/
> Alternator Protection Cable
> http://gmcmotorhome.info/APC.html
>
--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
-------
http://gmcmotorhome.info/
Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: [GMCnet] VAPOR RECOVERY VENTS [message #186336 is a reply to message #186333] |
Wed, 03 October 2012 18:49 |
armandminnie
Messages: 864
Registered: May 2009
Location: Marana, AZ
Karma: 2
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Senior Member |
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Gene,
I think that the vapor pressure in the tank is a good thing. I have had the experience (last April on the way to the GMCWS rally) of having the gas cap singing a high-pitched tune when I stopped to fill up. After filling up I left the cap off thinking that this pressure in the tanks was not good but the coach would barely run until I put the cap back on.
I do have a vapor recovery system and know from the leaking fuel and odors before I replaced it that it works at least a little.
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
visit my gmc blog
click here to visit gmcws.org
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| Re: [GMCnet] VAPOR RECOVERY VENTS [message #186346 is a reply to message #186345] |
Wed, 03 October 2012 19:37 |
armandminnie
Messages: 864
Registered: May 2009
Location: Marana, AZ
Karma: 2
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Senior Member |
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| Mr ERFisher wrote on Wed, 03 October 2012 17:29 |
Nope pumps supply the fuel
Gene
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I mean that the pressure keeps the fuel from boiling. I don't know how much pressure that gas cap holds before it audibly releases but whatever it is it increases the boiling point of the fuel in the tanks. Given that my coach wouldn't run with the cap off and would with the cap on I think it had an effect.
Armand Minnie
Marana, AZ
'76 Eleganza II TZE166V103202
visit my gmc blog
click here to visit gmcws.org
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| Re: [GMCnet] VAPOR RECOVERY VENTS [message #186354 is a reply to message #186351] |
Wed, 03 October 2012 21:12 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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You might as well give up, Armand.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] VAPOR RECOVERY VENTS [message #186368 is a reply to message #186360] |
Wed, 03 October 2012 23:05 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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I'm in process on renewing my lines.
There appears to be a one way check valve on the evaporation vent line. Is that proper?
I don't see it in the manual that way.
Dolph Santorine
Dolph@DolphSantorine.com
Phone: 304-219-3100
Cell: 740-312-5342
Http://www.DolphSantorine.com
Excuse me for not being my usual wordy and sporadically verbose self. This message is sent from my iPad, which is, in many ways, an iPhone on steroids.
No trees were killed in the sending of this message. Few long dead dinosaurs were involved. A large number of electrons were terribly inconvenienced.
On Oct 3, 2012, at 11:14 PM, Matt Colie <matt7323tze@gmail.com> wrote:
>
>
> We have a real problem here with terminology.
>
> Both tanks have three connections (let's pretend it is a transmode).
> Two 3/8 lines come from the pick-up/sending unit.
> A single 5/16 line come from the top of the tank.
>
> Now:
> The 3/8 line that is attached to the sock at the bottom of the tank is the fuel pick-up line.
> The 3/8 line that ends in the top of the sending unit is the fill vent line. (This description is an industry standard.)
> The 5/16 line that is in different places in the top of the tanks is the evaporation vent line. (Also a standard name.)
>
> The fill vent (recently call the vapor recovery line because of California) has one purpose and that is to vent the air being displaced by the fuel that you want to put into the tank.
>
> The evaporation vent line's only function is to pass vapor from the evaporating fuel to the carbon canister so it can be fed back into the engine and burned instead of released into the already polluted city air.
>
> Our coaches and some Corvettes are equipped with a float valve in the evaporative line to prevent liquid fuel from flooding the carbon canisters. That valve has to be there or the canisters will become loaded with wet gas during a fuel fill and so be useless until the are purged long enough to dry out.
>
> Whether you have one or two canisters, that part of the system is not supposed to ever be closed off. If it is working right, there will not be pressure in the tanks past what is possible by fueling (about 1psi - 34" of gasoline). There is actually an SAE safety spec. that says there will be no way that the tank can spew gasoline all over the person fueling the vehicle. Our tanks would be glad to do that without this vent because the fill fitting is actually below a nominal full level.
>
> There is a lot about the system that is - ah - suboptimal. However, when all the parts are working, it is not dangerous.
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will find
> SE Michigan - Twixt A2 and Detroit
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| Re: [GMCnet] VAPOR RECOVERY VENTS [message #186397 is a reply to message #186366] |
Thu, 04 October 2012 11:46 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| armandminnie wrote on Wed, 03 October 2012 20:49 |
| Carl S. wrote on Wed, 03 October 2012 19:12 |
You might as well give up, Armand.
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I just did. My coach works fine. How is yours?
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Mine works fine too. Plumbed as it was when it left the factory except with 'multi fuel' hose, and electric booster pump, and a few extra filters.
I'm confident that I will have to drop the tanks again some day, but I am not afraid of that. It was a fairly easy job. I may make some changes then, but until that point, all is well.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] VAPOR RECOVERY VENTS [message #186400 is a reply to message #186355] |
Thu, 04 October 2012 12:57 |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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Nope, no gas drip. The guy that took the canister out plugged the hose. When I found the plug I took it out. Kept spewing gas out the fill hole when I opened it, sometimes. Stopped after I pulled the plug from vent line that went to canister. All I know, works ok now.
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
[Updated on: Thu, 04 October 2012 13:03] Report message to a moderator |
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