Home » Public Forums » GMCnet » Fuel Vapor separator and charcoal Canister
|
|
|
|
|
|
|
|
| Re: Fuel Vapor separator and charcoal Canister [message #276896 is a reply to message #276865] |
Tue, 28 April 2015 10:31   |
 |
John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
|
Senior Member |
|
|
Larry:
This one will work, its pretty close to you and it is cheap. You just need to make a bracket which is easy for a fellow I.A. TEACHER 
Ebay Number 251883335457
Best Regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
|
|
|
|
|
|
| Re: Fuel Vapor separator and charcoal Canister [message #276899 is a reply to message #276865] |
Tue, 28 April 2015 10:41 |
|
John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
|
Senior Member |
|
|
Larry:
I Just looked in the shop.
I have one that I'll give you for nothing, that has a third fitting and no filter to replace. The third fitting goes to the air cleaner housing (which becomes the filter)
But you might find the cost to mail from Canada might be an issue.
Regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
|
|
|
|
| Re: Fuel Vapor separator and charcoal Canister [message #276900 is a reply to message #276865] |
Tue, 28 April 2015 11:05 |
|
John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
|
Senior Member |
|
|
I'm just doing some more thinking here.
Almost any GM full size vehicle from the early to late 70s had the same 2 port Canister with bottom filter that you need. The only difference between them was mounting and the bottom filter area. Our coaches mounted the canister in the splash area behind the wheels and so they added a restricted opening to protect from direct spray. The other cars mounted the canister higher up on the engine compartment where there was less dust and did not have the restriction. The mounting brackets are slightly different too. But new canisters do not usually come with brackets.
That being said I see that the one you identified from amazon had a bracket, but it is wrong for the coach. It also has a purge valve that that is not what your coach used. You could connect it to work if you wanted to however. The purge valve opens the canister to the Carb when there is vacuum on the ported vacuum fitting and engine temp is higher. (Temp vacuum switch) (Only purges canister off of idle and warm engine conditions.) Not really a problem for you with fuel injection which adjusts for mixture anyway.
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
|
|
|
|
| Re: Fuel Vapor separator and charcoal Canister [message #276903 is a reply to message #276865] |
Tue, 28 April 2015 11:10 |
|
John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
|
Senior Member |
|
|
And finally one more thing and I'll shut up!!
You will really enjoy not smelling so much gasoline fumes when you walk by your coach! !!!
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
|
|
|
|
|
|
|
|
| Re: [GMCnet] Fuel Vapor separator and charcoal Canister [message #276927 is a reply to message #276926] |
Tue, 28 April 2015 19:09 |
Daniel Starks
Messages: 20
Registered: April 2015
Karma: 0
|
Junior Member |
|
|
Connects to gas tank or filler neck above liquid level. If gas
evaporates, for example due to a rise in temperature, the fumes are
absorbed in the canister instead of being released into the air. When
you start the engine, a line from the intake manifold to the canister
sucks the fumes out of the canister. A check valve in this line keeps
anything from going from the manifold to the canister. It is used with
a gas cap that has a one way vent, so air can enter the tank as gasoline
is pumped out, but fumes cannot go from the tank to the air.
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of
Larry
Sent: Tuesday, April 28, 2015 5:47 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Fuel Vapor separator and charcoal Canister
OK, I guess I am ignorant as to how this canister works. It has a
filter? Where? Where does it go, why is it there? What is it's purpose?
Thanks.
--
Larry
78 Royale w/500 Caddy
Menomonie, WI.
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] Fuel Vapor separator and charcoal Canister [message #276929 is a reply to message #276927] |
Tue, 28 April 2015 19:55 |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
|
Senior Member |
|
|
Daniel Starks wrote on Tue, 28 April 2015 19:09Connects to gas tank or filler neck above liquid level. If gas
evaporates, for example due to a rise in temperature, the fumes are
absorbed in the canister instead of being released into the air. When
you start the engine, a line from the intake manifold to the canister
sucks the fumes out of the canister. A check valve in this line keeps
anything from going from the manifold to the canister. It is used with
a gas cap that has a one way vent, so air can enter the tank as gasoline
is pumped out, but fumes cannot go from the tank to the air.
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of
Larry
Sent: Tuesday, April 28, 2015 5:47 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Fuel Vapor separator and charcoal Canister
OK, I guess I am ignorant as to how this canister works. It has a
filter? Where? Where does it go, why is it there? What is it's purpose?
Thanks.
--
Larry
OK, I get that, but I don't get the filter with the canister,,, It has a
filter? Where? Where does it go, why is it there? What is it's purpose?
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
|
|
|
|
| Re: [GMCnet] Fuel Vapor separator and charcoal Canister [message #276935 is a reply to message #276926] |
Tue, 28 April 2015 21:20 |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Larry,
"A picture is worth a thousand words:"
https://www.google.com.au/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=automotive+charcoal+canister+picture
Regards,
Rob M.
The Pedantic Mechanic
USAussie - Downunder
USA '75 Avion - Double Trouble TZE365V100426
AUS '75 Avion - The Blue Streak TZE365V100428
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Larry
Sent: Wednesday, April 29, 2015 9:47 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Fuel Vapor separator and charcoal Canister
OK, I guess I am ignorant as to how this canister works. It has a filter? Where? Where does it go, why is it there? What is it's
purpose?
Thanks.
--
Larry
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
|
|
|
|
| Re: Fuel Vapor separator and charcoal Canister [message #276938 is a reply to message #276865] |
Tue, 28 April 2015 22:01 |
|
John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
|
Senior Member |
|
|
LARRY
Here is some simple photos.
http://www.gmcmhphotos.com/photos/discussion-photos/p57898-carbon-canister.html
http://www.gmcmhphotos.com/photos/discussion-photos/p57899-carbon-canister.html
http://www.gmcmhphotos.com/photos/discussion-photos/p57900-carbon-canister.html
I know that I'm not explaining how it works.
Regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
[Updated on: Tue, 28 April 2015 22:28] Report message to a moderator |
|
|
|
| Re: [GMCnet] Fuel Vapor separator and charcoal Canister [message #276939 is a reply to message #276929] |
Tue, 28 April 2015 22:12 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
Canister is filled with activated charcoal
It is a filter.
Jim Hupy
On Apr 28, 2015 5:55 PM, "Larry" wrote:
> Daniel Starks wrote on Tue, 28 April 2015 19:09
>> Connects to gas tank or filler neck above liquid level. If gas
>> evaporates, for example due to a rise in temperature, the fumes are
>> absorbed in the canister instead of being released into the air. When
>> you start the engine, a line from the intake manifold to the canister
>> sucks the fumes out of the canister. A check valve in this line keeps
>> anything from going from the manifold to the canister. It is used with
>> a gas cap that has a one way vent, so air can enter the tank as gasoline
>> is pumped out, but fumes cannot go from the tank to the air.
>>
>> -----Original Message-----
>> From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of
>> Larry
>> Sent: Tuesday, April 28, 2015 5:47 PM
>> To: gmclist@temp.gmcnet.org
>> Subject: Re: [GMCnet] Fuel Vapor separator and charcoal Canister
>>
>> OK, I guess I am ignorant as to how this canister works. It has a
>> filter? Where? Where does it go, why is it there? What is it's purpose?
>>
>>
>> Thanks.
>> --
>> Larry
>
> OK, I get that, but I don't get the filter with the canister,,, It has a
> filter? Where? Where does it go, why is it there? What is it's purpose?
> --
> Larry
> 78 Royale w/500 Caddy
> Menomonie, WI.
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: Fuel Vapor separator and charcoal Canister [message #276940 is a reply to message #276865] |
Tue, 28 April 2015 22:20 |
|
John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
|
Senior Member |
|
|
SORRY you do want explaination!
Atmospheric air moves in and out of the tank through the carbon canister. (VENTS) As the air moves out of the tank, he actuvated carbon absorbs the gas vapors and stores them. ( same as aquarium charcoal) . When the engine runs it pulls fresh air through the filter to purge the vapors from the carbon. while not lots of air moves, that filter does get plugged especially on the GMC because it is on the frame right behind the front wheel. Most GM vehicles put it in a better place. You need to change the filter regularly too. Many people do not know its there and never change it. Almost every new vehicle uses a closed system so even experienced people do not know Its even there. You have to be stuck in the 70s to know, closed systems also put the canister in an obscure place because it does not need servicing.
Our system is simple. One tank fitting. One carb fitting. One filter. Done.
The carbon does not wear out but it can break down. Older ones are usually good. Unless the filter was removed and dirt went directly to the carbon. Ours actually have a foam separator to keep the carbon in. But all of this is dificult to see because of the restricted air inlet. About 1 1/2 inches compared to the 4 from other applications.
Regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
[Updated on: Tue, 28 April 2015 22:22] Report message to a moderator |
|
|
|
|
|
| Re: [GMCnet] Fuel Vapor separator and charcoal Canister [message #276942 is a reply to message #276939] |
Tue, 28 April 2015 22:22 |
 |
ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
|
Senior Member |
|
|
Then the activated charcoal acts as a sponge to hold the vapor until it’s sucked in to the intake manifold and burned as fuel, yes?
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, CA
> On Apr 28, 2015, at 8:12 PM, James Hupy wrote:
>
> Canister is filled with activated charcoal
> It is a filter.
> Jim Hupy
> On Apr 28, 2015 5:55 PM, "Larry" wrote:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
|
|
|
|
| Re: Fuel Vapor separator and charcoal Canister [message #276943 is a reply to message #276865] |
Tue, 28 April 2015 22:37 |
|
John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
|
Senior Member |
|
|
One more thing.
Many people think the tanks vent through the fuel cap and think the canuster is not needed hense they get removed. The tank only vents through the canister. All the air going into the tank as the levels drop go through the canister vent system. The cap only vents if the conditions are extraordinary. ( too much vacuum or too much pressure)
But Im sure that will start a number of comments.
regards
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
|
|
|
|
Goto Forum:
Current Time: Tue Sep 24 05:26:04 CDT 2024
Total time taken to generate the page: 0.01627 seconds
|
GMCforum
Search
Help
Register
Login
Home
