Charcoal canister and vacuum routing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sport/Truck · 04-09-2009, 08:05 PM

I'm hooking up my vacuum lines and was looking at some old pictures I took before the tear down, but want to compare to something else to make sure it was correct.
So I was referring back to my friends unmolested 71 GMC Suburban.
I noticed it didn't have a port on the carburetor for the charcoal canister. I had him double check to see, and it doesn't have one!

Did they not use one on the 3/4 tons? Do I need one on mine? How do you tell if it's working or not?

Anyone have a diagram on how this hooks up. My Chiltons manual doesn't list my year model for some reason.

Thanks,
s/t

**leddzepp** · 04-09-2009, 08:47 PM

Charcoal canisters/EEC's were not used on 3/4 tons

Sport/Truck · 04-09-2009, 10:43 PM

That explains it. Can we remove ours without any ill affects?
Also, I have a steel line for my vacuum advance and it's somewhat mangled. Can I just use regular vacuum line until i fab another out of SS steel?
s/t

**special-K** · 04-10-2009, 08:09 PM

Yes,I always route them to the trash can.LOL
And,yes on the vacuum question.Definately better off than with pinched steel line.

Sport/Truck · 04-10-2009, 10:30 PM

Quote:

Originally Posted by special-K

Yes,I always route them to the trash can.LOL
And,yes on the vacuum question.Definately better off than with pinched steel line.

So you just cap off the steel line that feed the canister from the gas tank?
I might consider doing that.
s/t

Lugnut64052 · 04-11-2009, 03:05 AM

Quote:

Originally Posted by special-K

I always route them to the trash can.

**yote1234** · 04-11-2009, 05:23 PM

wait!.. total removal of the entire "charcoal canister" system leaves no ill effects?

04-09-2009, 08:05 PM	#1
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Charcoal canister and vacuum routing I'm hooking up my vacuum lines and was looking at some old pictures I took before the tear down, but want to compare to something else to make sure it was correct. So I was referring back to my friends unmolested 71 GMC Suburban. I noticed it didn't have a port on the carburetor for the charcoal canister. I had him double check to see, and it doesn't have one! Did they not use one on the 3/4 tons? Do I need one on mine? How do you tell if it's working or not? Anyone have a diagram on how this hooks up. My Chiltons manual doesn't list my year model for some reason. Thanks, s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

04-09-2009, 08:47 PM	#2
leddzepp Moderator Join Date: May 2007 Location: Southern Cal Posts: 20,014	Re: Charcoal canister and vacuum routing Charcoal canisters/EEC's were not used on 3/4 tons __________________ 1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed. 1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck. RIP ElJay RIP 67ChevyRedneck RIP Grumpy Old Man RIP FleetsidePaul

04-09-2009, 10:43 PM	#3
Sport/Truck Sierra Grande Club Join Date: Jan 2007 Location: New Mexico USA Posts: 2,433	Re: Charcoal canister and vacuum routing That explains it. Can we remove ours without any ill affects? Also, I have a steel line for my vacuum advance and it's somewhat mangled. Can I just use regular vacuum line until i fab another out of SS steel? s/t __________________ 1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe.

04-10-2009, 08:09 PM	#4
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,858	Re: Charcoal canister and vacuum routing Yes,I always route them to the trash can.LOL And,yes on the vacuum question.Definately better off than with pinched steel line. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

04-11-2009, 05:23 PM	#7
yote1234 Senior Member Join Date: Feb 2003 Location: Gold Canyon Arizona Posts: 4,365	Re: Charcoal canister and vacuum routing wait!.. total removal of the entire "charcoal canister" system leaves no ill effects? __________________ 1971 K5 CST Blazer 1951 -3100 5 window short bed 4sp 1965 Chevelle Malibu 283 (sadly sold) 1968 Camaro 327 1968 Honda mini-trail z50a #377 1966 uh 1-D Huey



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