Charcoal canister filter replacement - JeepForum.com
 
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post #1 of 12 Old 05-10-2010, 12:12 PM Thread Starter
JeffreyCharles
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1976 CJ5 
 
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Charcoal canister filter replacement

After reading up on a number of threads regarding fuel vapor smells/leakage - particularly Mike Romain's postings - I decided to give a shot at replacing the filter at the bottom of my canister while I was doing an oil change over the weekend. Picked up a replacement filter from Napa (part #2998 - Filter Breather) for about $3, pulled the canister up and flipped it over and was initially stumped as to how to remove the old filter. It quickly became obvious one simply pulls it out past the plastic molding across the canister bottom. Mine wasn't attached or held in place by anything other than that molding (a lip around the edge of the canister bottom and a thin bar across the middle).

At first I just kinda poked at the old filter (which was filthy) and then I set the canister back down, upright, to answer a question from my wife. At that point I heard an odd sound which turned out to be the charcoal running out of the canister all over the ground. Apparently I'd shifted the old filter to the side just enough to create a hole.

So I cleaned that up, put the charcoal back into the canister (about a cup's worth), installed the new filter and all seems well.

My question: is it really the case that the filter is just held in place the way I describe? Or is mine perhaps missing some screws or some other retaining mechanism to make it all more secure? Seems like it would be easy for a branch or something to poke up just right and catch that filter, pushing it aside just enough to allow the charcoal to all fall out.

Here are the old and new filters:

http://jeep.smallcraft.net/projects/...s/IMG_0406.jpg

And here's the underside of the canister:

http://jeep.smallcraft.net/projects/...s/IMG_0407.jpg


Jeffrey Charles
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post #2 of 12 Old 05-10-2010, 02:53 PM
Mike Romain
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The newer ones have a screen to hold in the charcoal better, but otherwise that's the same as mine.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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post #3 of 12 Old 05-10-2010, 04:37 PM Thread Starter
JeffreyCharles
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Thanks Mike!

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post #4 of 12 Old 05-10-2010, 09:28 PM
Hybrid Jeep
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Wouldn't be a bad idea to pick yourself up some activated carbon at a pet store.. replace the 30 year old stuff with new!
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post #5 of 12 Old 05-12-2010, 11:07 AM Thread Starter
JeffreyCharles
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Good idea, I hadn't thought of that. Same stuff, huh?

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post #6 of 12 Old 05-12-2010, 11:27 AM
thord
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i replace the filter on mine, but did not see a way to get the old charcoal out. how do you do that to replace it?
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post #7 of 12 Old 05-12-2010, 04:29 PM Thread Starter
JeffreyCharles
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Though I haven't replaced my charcoal at this point it was very easy to remove the old charcoal once the filter was removed - simply turn the canister right-side up over a bucket and all the charcoal will simply fall out on its own. At least, that's the way it was with my canister.

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post #8 of 12 Old 05-12-2010, 08:06 PM
DUX4LIFE
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I cut the seam at the bottom and the bottom grate came off and the charcoal came out. I rinsed the charcoal and poured it back in. Then reused the filter element and glued the bottom back on. If your careful when you cut the seam it will go back together easily. I think there is a lip on the bottom.
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post #9 of 12 Old 07-10-2015, 06:24 AM
Rebel1970
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Ok Guys
Here is my question. Are these filter really necessary, and what do they do?
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post #10 of 12 Old 07-10-2015, 07:11 AM
Mike Romain
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Quote:
Originally Posted by Rebel1970 View Post
Ok Guys
Here is my question. Are these filter really necessary, and what do they do?
They are a $2.00 air filter for the gas tank vent. I have plugged mine up playing in mud and when this happens a vacuum gets created in the gas tank starving it for fuel. I have had to drive home several times with my gas cap cracked open so it would run.
Even at idle after warming up, when it gets too dirty from just off road dust and I open the gas cap, my idle speed comes up noticeably.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
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post #11 of 12 Old 07-11-2015, 09:22 PM
raven3
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On my stock 73 charcoal canister
there is both a plastic grating and a bar across the bottom
cover, seems redundant.
Believe the bottom cover lip to cylinder seam
can be cut with a sharpe exacto knife.
With bottom cover removed, the pad and activated charcoal can be removed and replaced.
What to use for an adhesive for polypropylene plastic is unknown.
Since canister is made with thermo plastic material maybe the seam can be made with soldering iron,
by melting the plastic because the seam does not have to be water tight.
On my canister the pad decomposed and allowed all the carbon to gravity flow out the bottom through the grating.
Could have happened decades ago.
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post #12 of 12 Old 07-13-2015, 05:03 PM Thread Starter
JeffreyCharles
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Quote:
Originally Posted by Rebel1970 View Post
Ok Guys
Here is my question. Are these filter really necessary, and what do they do?
Think of it as a completely passive, benign system that actually does something good. Doesn't rob you of any performance, horsepower, etc. And it captures gas fumes to be drawn back in and burned later on. The tank *needs* to be vented somehow, and having the canister at the end of the vent line ensures gas fumes aren't just escaping to the atmosphere (whether or not you care about the environment is beside the point, it doesn't smell good and that person who cooks your dinners is gonna complain...).

Keep it, fix it if broken, and get rid of performance-robbing stuff elsewhere.

Jeffrey Charles
http://jeep.smallcraft.net/
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