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Canister hoses ? [message #278867]

Mon, 01 June 2015 20:25

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

I am hooking up a 3 port canister. 1976 Eleganza. One line goes to the tank. One small line I believe goes to manifold vacuum and a larger line I think "T" s into the pcv hose. Is this correct?

C. Boyd
76 Crestmont
East Tennessee

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Re: Canister hoses ? [message #278875 is a reply to message #278867]

Mon, 01 June 2015 21:23

Larry

Messages: 2875
Registered: January 2004
Location: Menomonie, WI

Karma: 10

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C Boyd wrote on Mon, 01 June 2015 20:25

I am hooking up a 3 port canister. 1976 Eleganza. One line goes to the tank. One small line I believe goes to manifold vacuum and a larger line I think "T" s into the pcv hose. Is this correct?

I just installed a 3 port canister. (A PO removed the whole charcoal system). So, one line to the fuel separator in drivers side wheel well. One line to Manifold Vacuum (above throttle plates) and the 3rd larger line I put to the aircleaner with a PVC type of air filter in the AIR CLEANER housing. I Googled it (can't remember the terms I used) and diagrams told me that was the way to do it.

Larry

78 Royale w/500 Caddy
Menomonie, WI.

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Re: Canister hoses ? [message #278878 is a reply to message #278867]

Mon, 01 June 2015 21:50

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma: 12

Senior Member

How can manifold vacuum be above the throttle plates ??

John Lebetski
Woodstock, IL
77 Eleganza II

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Re: Canister hoses ? [message #278881 is a reply to message #278867]

Mon, 01 June 2015 22:01

George Beckman

Messages: 1085
Registered: October 2008
Location: Colfax, CA

Karma: 11

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C Boyd wrote on Mon, 01 June 2015 18:25

I am hooking up a 3 port canister. 1976 Eleganza. One line goes to the tank. One small line I believe goes to manifold vacuum and a larger line I think "T" s into the pcv hose. Is this correct?

I think we are all trying to say the same thing. Ported vacuum (above the throttle plates) for the little one is what you want so it only purges when you are not idling. I have a TBI so the it is different as I have a handy port on the TBI to suck out the fumes. Remembering back to my '78, I believe it did T it to the PCV. You want some "real suction" here so it gets purged.

'74 Eleganza, SE, Howell + EBL
Best Wishes,
George

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Re: Canister hoses ? [message #278894 is a reply to message #278867]

Tue, 02 June 2015 01:30

John Heslinga

Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada

Karma: 4

Senior Member

If the 3 port canister has no filter on the bottom. The third port goes to the air cleaner.(the filteted side) It takes the place of the filter on the bottom. If it has a filter, then the third port goes to the carb float bowl.(to collect float bowl vapor) The canister usually has labels embossed on it. Some applications put a small fitting on the third port to simply allow unfiltered air to enter the canister.(Ill post a picture tomorrow)

As far as I know, none of our GMC applications hook up to the PVC. I'll check in the morning and correct if I'm wrong.

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

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Re: Canister hoses ? [message #278896 is a reply to message #278867]

Tue, 02 June 2015 01:43

John Heslinga

Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada

Karma: 4

Senior Member

Small correction: none if the applications with a simple 3 port canister. 77 78 use a more complex active vapor containment using purge valves on top of the canisters using temperature delay valves, vacuum signals and controls.

John and Cathie Heslinga 1974 Canyonlands 260 455, Manny tranny and 1 ton, 3:70 LS, Red Seal Journeyman, DTE, BEd. MEd. Edmonton, Alberta

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Re: Canister hoses ? [message #278913 is a reply to message #278867]

Tue, 02 June 2015 08:04

jhbridges

Messages: 8412
Registered: May 2011
Location: Braselton ga

Karma: -74

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mine - seriesed two canister - has only two ports, marked TANK (To the vapor separator) and CARB (To ported vacuum). The upper canister has a nipple on the bottom which goes to the TANK fitting on the lower canister. The other port on the lower canister (CARB) is sealed with a cover which was obviously installed at manufacture. The bottom of the lower has the opening to the air and filter behind it.

--johnny

Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons. Braselton, Ga. I forgive them all, save those who hurt the dogs. They must answer to me in hell

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Re: Canister hoses ? [message #279015 is a reply to message #278867]

Wed, 03 June 2015 14:45

John Heslinga

Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada

Karma: 4

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I promised to put up some information on the Carbon Canisters. It is now on the Photo Site. I have more work to do but it is a start. it is here.

http://www.gmcmhphotos.com/photos/g6792-carbon-or-vapor-canister.html

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: Wed, 03 June 2015 14:46]

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Re: Canister hoses ? [message #279038 is a reply to message #279015]

Thu, 04 June 2015 02:19

Ken Burton

Messages: 10030
Registered: January 2004
Location: Hebron, Indiana

Karma: 10

Senior Member

Thanks for the good work and photos. Now you are making me open mine up and see what it looks like. Mine has not been attached to the carb for at least 10 years. I guess I'll have to fix it now.

Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

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Re: Canister hoses ? [message #279083 is a reply to message #279038]

Thu, 04 June 2015 20:01

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

Thanks all for the help. I have one line going to tank, one line to ported vacuum for signal, and the purge line to bottom of air filter housing that I installed. I think it is suppose to go to the rear of q-jet toward the top above the butterflies. I'm dealing with Edelbrock intake, carb, and air filter with platform built over the doghouse.

C. Boyd
76 Crestmont
East Tennessee

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Re: Canister hoses ? [message #279115 is a reply to message #278867]

Fri, 05 June 2015 08:44

John Heslinga

Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada

Karma: 4

Senior Member

Charles:

On the Canister you will find labels indicating where the hoses go. Forgive me but: the way you describe your connections it sounds like you are wrong or don't quite understand the connections purpose. I just want to clarify.

"Carb" port is not a signal it is Purge. It goes to ported vacuum. (Signal conections Open / close Valves in valved canisters) the reason it is ported, is so that you only purge the canister at part throttle, not idle.

"Tank" port is from the Vapor / Liquid Separator (Tank)

"Air Cleaner" port to the Air Cleaner. It is the fresh air for the Canister. It is not purging the Canister.

If you do not have an "Air cleaner" port it will have:

"Bowl" goes to the top of the carb float bowl so float bowl vapors go to the canister

Wrong connections will only defeat what good you are trying to do or make the engihe run shitty.

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

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Re: Canister hoses ? [message #279132 is a reply to message #279115]

Fri, 05 June 2015 12:03

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

Thank you, the port I have going to air filter is marked Air. The one going to tank is not changed and has been there. The small line I have to ported vacuum. They are all different sizes and smallest is ported and was hooked up there while dist was hooked to manifold vacuum which I did change to ported side and "T" the canister off it. The Eldebrock carb has only one ported port. Biggest question I had was did the "air" line off the canister go to the filter or pcv valve. I opted for filter thinking a air leak in the canister would cause an engine vacuum leak. I am hoping this is right.

John Heslinga wrote on Fri, 05 June 2015 09:44

Charles:

On the Canister you will find labels indicating where the hoses go. Forgive me but: the way you describe your connections it sounds like you are wrong or don't quite understand the connections purpose. I just want to clarify.

"Carb" port is not a signal it is Purge. It goes to ported vacuum. (Signal conections Open / close Valves in valved canisters) the reason it is ported, is so that you only purge the canister at part throttle, not idle.

"Tank" port is from the Vapor / Liquid Separator (Tank)

"Air Cleaner" port to the Air Cleaner. It is the fresh air for the Canister. It is not purging the Canister.

If you do not have an "Air cleaner" port it will have:

"Bowl" goes to the top of the carb float bowl so float bowl vapors go to the canister

Wrong connections will only defeat what good you are trying to do or make the engihe run shitty.

Best regards.

C. Boyd
76 Crestmont
East Tennessee

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Re: Canister hoses ? [message #279133 is a reply to message #279083]

Fri, 05 June 2015 12:03

Bullitthead

Messages: 1411
Registered: November 2013

Karma: 5

Senior Member

Chuck, in general, don't tee anything into the PCV line unless it has an electrical or vacuum actuated shutoff valve on the teed in line, and don't arrange any fuel vapor plumbing that will or might allow raw fuel vapors to collect in the crankcase.

Terry Kelpien ASE Master Technician 73 Glacier 260 Smithfield, Va.

[Updated on: Fri, 05 June 2015 12:04]

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Re: Canister hoses ? [message #279134 is a reply to message #279133]

Fri, 05 June 2015 12:06

C Boyd

Messages: 2629
Registered: April 2006

Karma: 18

Senior Member

Yes, thank you Terry.

Bullitthead wrote on Fri, 05 June 2015 13:03

Chuck, in general, don't tee anything into the PCV line unless it has an electrical or vacuum actuated shutoff valve on the teed in line, and don't arrange any fuel vapor plumbing that will or might allow raw fuel vapors to collect in the crankcase.

C. Boyd
76 Crestmont
East Tennessee

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