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#1 |
Senior Member
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Location: Orem, Utah
Posts: 7,901
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Evaporative Canister
If I understand the operation of the canister correctly, one port is connected to the evap line from the fuel tank, one is connected to ported vacuum on the carb, and the third goes to a T in the PCV hose.
Is this correct? If so, does anyone know where I can buy a canister that will fit?
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#2 |
Senior Member
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Location: TN.
Posts: 8,069
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Re: Evaporative Canister
They come up for sale here from time to time.
I don't if this one sold it's an old link. Link: http://67-72chevytrucks.com/vboard/s...light=canister. He a good guy to buy parts from. .
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________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build |
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#3 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Here is the picture out of the service manual I blew it up.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#4 |
Who Changed This?
![]() Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,373
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Re: Evaporative Canister
NAPA carries them. Looks like the second one on the page, IIRC.
https://www.napaonline.com/en/search...Qualified=true
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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#5 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,901
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Re: Evaporative Canister
Thanks for all the help. The links and the pictures are very helpful.
I have a question about the one in the NAPA link - I found a similar AC Delco and a Dorman unit as well. All three seem to have a cap partially covering one port that's labeled "Air" and is open to the atmosphere. Is that the one that would connect to the PCV?
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#6 | |
Who Changed This?
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Location: Simi Valley, CA
Posts: 10,373
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Re: Evaporative Canister
Quote:
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA Last edited by Steeveedee; 09-26-2020 at 05:50 PM. |
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#7 |
Senior Member
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Location: Cypress, TX
Posts: 3,683
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Re: Evaporative Canister
I've been looking at these and reading about them. I am not an expert, so take what I say for what it's worth. I believe the ones that do not have an obvious purge valve on top with a separate small vacuum connector, and with only 2 connections without dust cap do not have a purge valve integrated into them. You would have to buy a purge valve to put between the PCV hose T connector and the canister. So, I think the the ports are fuel tank, and purge, and the air port is there to let fresh air in. The one in the forum for-sale listing looks like the entire top is broken off the purge valve. If I were setting this up for my truck, I would get a new canister with the 2 connections (plus air inlet) and get a separate vacuum operated purge valve.
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#8 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,901
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Re: Evaporative Canister
The pic Andy provided doesn't show a purge valve as far as I can see. It looks like it just hooks into the PCV system with a T.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#9 |
Senior Member
![]() Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,683
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Re: Evaporative Canister
Yes, that is because the valve was integrated on top of the canister. Those are terrible pictures, no good detail. Just for hose routing, and not really good for that.
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#10 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Here are some more but not for the purge tank. Not at the house so I can't look through my manuals to see if there is anything better.
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#11 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,901
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Re: Evaporative Canister
OK, makes sense. I've got a purge valve on the way.
Those things sure are expensive...
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#12 |
Senior Member
![]() Join Date: Jul 2018
Location: Vacaville, CA
Posts: 529
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Re: Evaporative Canister
I may have a canister/bracket in my parts stash. I won’t be able to check until Sunday afternoon, but PM me if you are interested. If memory serves, it will need a new filter at the bottom and the charcoal for it (filter is available and charcoal can be sourced on Amazon). Not sure which one/year it is, but the canister and valve up top were intact.
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1971 Custom/10 - 350/3 speed, Orange/White roof |
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#13 |
Senior Member
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Location: Northern Nevada
Posts: 7,224
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Re: Evaporative Canister
A good canister is hard to find, but they can be had. Here's some info. for a 1971:
Original canisters for 1971: 7028129 or 7030541: The canister on my truck was 7030541. GM replacement canister: 7030605 Another replacement that works: 17063011. The "Carb Bowl" is sealed on at least some of these canisters. The Carb Bowl is not used for a 1971 Chevy truck.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#14 |
Senior Member
![]() Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,901
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Re: Evaporative Canister
I was able to find the GM 7030605 online for $75. Rechinca, I may have my old bracket, but I have to sort through my parts stash to make sure. Thanks for the offer - I'll PM you if I need it.
Thanks for all the help.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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#15 |
Senior Member
![]() Join Date: Jul 2018
Location: Vacaville, CA
Posts: 529
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Re: Evaporative Canister
No problem. I know I have a spare bracket too if you can't find it. Sorry I didn't get back to you. Went to the Turlock swap meet and got back late.
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1971 Custom/10 - 350/3 speed, Orange/White roof |
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