Charcoal canister? - JeepForum.com
 
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post #1 of 12 Old 02-19-2008, 09:28 PM Thread Starter
Redskybri
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Charcoal canister?

What the hell is it. Do I need it? theres a hose coming of of mine that leads to nothing. Is that bad? Extreme newby be easy on me..........


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post #2 of 12 Old 02-19-2008, 09:43 PM
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Yes you need it to keep your engine light from coming on.

It is also called an evaporative emission canistor. The fuel system is completely sealed and any fuel that evaporates goes into the canistor and the porous charcoal absorbs the gas. When you start your engine back up the vacuum from the enigine uses up those vapors.

Its basically useless to the mechanics of the engine, but if it leaks the ecm detects a loss of vaccum and trips the check enigne light.

Most people call it a dummy light because it doens't affect the performance of the engine, it just makes the tree huggers angry that tiny bits or your fuel is evaporating into thin.

Although as much as gas is now, I don't want any of it evaporating either
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post #3 of 12 Old 02-19-2008, 09:45 PM
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Oh and the hose coming off of it is probably a vent...because at certain times the system does open to purge air for reasons I am uncertain of
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post #4 of 12 Old 02-19-2008, 09:47 PM Thread Starter
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That clears up alot. The hose coming off of the cap is not connected to anything is that normal?

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post #5 of 12 Old 02-19-2008, 09:48 PM Thread Starter
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Thanks alot!

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post #6 of 12 Old 02-19-2008, 09:49 PM
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I would say yes as long as theres only one that is open to atmosphere
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post #7 of 12 Old 02-19-2008, 09:51 PM
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No prob just glad I can return favors from what I've learned on this forum....Pay it forward
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post #8 of 12 Old 02-20-2008, 08:54 AM
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Quote:
Originally Posted by knipdm01 View Post
Yes you need it to keep your engine light from coming on.
I didn't know the check engine light ever went off! LOL

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post #9 of 12 Old 02-20-2008, 09:52 AM
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I have the old 4.2L and the evap canister is one of the few pieces of emissions equipment I still have! Not sure if it applies to the 4.0 but someone was saying they were getting a fuel smell in the vehicle when they had a problem with the cannister

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post #10 of 12 Old 02-20-2008, 11:09 AM
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I have a 4.2 nuttered with a weber on it and am slowly getting rid of my emission stuff however I am hearing you need it as the tank vent is on itas well as vac lines going to the CTO and one is ported vacuum.If you dont need it then how did you guys route the vacuum lines ? Thanks
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post #11 of 12 Old 02-20-2008, 11:17 AM
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Originally Posted by oldwindsurfer View Post
I have a 4.2 nuttered with a weber on it and am slowly getting rid of my emission stuff however I am hearing you need it as the tank vent is on itas well as vac lines going to the CTO and one is ported vacuum.If you dont need it then how did you guys route the vacuum lines ? Thanks
As long as there is not a vacuum leak there is no performance benefit to removing the canister. Plus, if you do remove it then you have to deal with the fuel tank vent another way which then means gas fumes elsewhere. I would try to keep it.

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post #12 of 12 Old 02-20-2008, 11:37 AM
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Originally Posted by jbolty View Post
As long as there is not a vacuum leak there is no performance benefit to removing the canister. Plus, if you do remove it then you have to deal with the fuel tank vent another way which then means gas fumes elsewhere. I would try to keep it.
I'm with him my vehicle is setup with vacuum lines to the 4wd actuator, EGR, CTO, evap canister, PCV, and vacuum advance, thats it and it runs great! but if you have to get rid of it I think you need to get a vented gascap so the pressure can release outside of the system and then have to cap off all the vent lines. Have read a few posts from people who have done this just can't remember who they were.

Rick

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