LT1-LT4 Modifications 1993-97 Gen II Small Block V8

EVAP cannister shot...What to do?

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Old Dec 4, 2006 | 09:47 AM
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Default EVAP cannister shot...What to do?

My Evap cannister is filling the vaccum line with charcoal. A new one costs $50.00.

Can I take it off and either gut it or bypass it?
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Old Dec 5, 2006 | 09:03 AM
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to the top
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Old Dec 5, 2006 | 10:24 AM
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Were is this actually located I never knew the LT1 had a EVAP cannister or I might have just taken it off. You arent talking about the AIR pump and assembly are you. If it is that you can remove the whole thing plug the holes.
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Old Dec 5, 2006 | 10:53 AM
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The evap canister is behind the rear driver side wheel. I had the same problem and just replaced the canister, solenoid, and vacuum sensor. I'm not sure if there's a good way to bypass the system, but you will most likely throw codes if you don't remove those codes from the PCM.
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Old Dec 5, 2006 | 11:06 AM
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lol that explains why i could not see it nice to know were it is now.
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Old Dec 5, 2006 | 01:16 PM
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Originally Posted by Camaro_freak
The evap canister is behind the rear driver side wheel. I had the same problem and just replaced the canister, solenoid, and vacuum sensor. I'm not sure if there's a good way to bypass the system, but you will most likely throw codes if you don't remove those codes from the PCM.
It can easily be tuned out with my custom tune, no problem there.
From a physical standpoint I just need to either bypass the cannister or gut the cannister.

With my new engine in the work I dont want charcol going down its pie hole.
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Old Dec 5, 2006 | 02:15 PM
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Were does the vaccume line for this attach to the engine.
Edit NVM I found out hmm I think I might try to bypass this or just lose it totally I have to get a tune for H/C set-up anyway.
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Old Dec 5, 2006 | 02:27 PM
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Wont pass emissions, its a cheap, so buy another

Last edited by BlackScreaminMachine; Dec 5, 2006 at 02:55 PM.
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Old Dec 5, 2006 | 02:34 PM
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why would you bother getting rid of it? it doesn't affect performance at all to leave it on there plus you would have to get a venting gas cap, which i don't think you can, which will also not pass the pressure test. all the evap does is hold fuel vapors until it purges into the intake. it only does that at cruise. kinda like egr, which also doesn't affect performance in any way shape or form.
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Old Dec 5, 2006 | 08:06 PM
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Originally Posted by YodiBrodi
why would you bother getting rid of it? it doesn't affect performance at all to leave it on there plus you would have to get a venting gas cap, which i don't think you can, which will also not pass the pressure test. all the evap does is hold fuel vapors until it purges into the intake. it only does that at cruise. kinda like egr, which also doesn't affect performance in any way shape or form.
I want to get rid of it because:
1. It caused dangerous pressure build up in the tank when the line clogged with charcoal.
2. It dumped some amounts of charcoal into my engine.
3. Provent to be unreliable.

I am thinking that the system will still work although it wont be filtering with the charcoal, it should still burn up.
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Old Dec 5, 2006 | 08:56 PM
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how can i tell if i still have it somehow i doubt i have it... my fuel tank releases pressure whenever i open cap but i know thats normal
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Old Dec 6, 2006 | 08:52 AM
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Originally Posted by Gun5
how can i tell if i still have it somehow i doubt i have it... my fuel tank releases pressure whenever i open cap but i know thats normal
Should be able to pull the big plastic wheel well on the left rear. You would see it.

Since mine was not venting cause of the charcoal clogged line, it blew like a leaf blower during the summer when the cap was removed. Actually pretty scary thinking about it if I had a wreck since the vapors are more explosive than the gas.
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Old Dec 6, 2006 | 10:24 AM
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I took mine off. No problems
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