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Old 07-29-2008, 08:13 PM   #1
rketr's Avatar
Join Date: Sep 2007
Location: San Antonio, TX
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Relocating EVAP Canister

(thought I already posted this, but a quick search shows I did not...)

Recently did a comp cut on my '03 TJ and had to deal with relocating the evap canister that is under the passenger rear corner. Typically I've seen people just swing the can into the tub opposite where it originally was or move it to the engine compartment.

My problem is 1) I cannot loose the rear seat due to bringing the kiddo's along with me, 2) I've moved the rear seat back 5" to give them a little more leg room, and 3) the engine compartment is pretty full as it is. I didn't want to have to run everything up to the engine and couldn't find a space for it up there anyhow.'s my solution...

In short, I put the charcoal canister behind the back seat, build a bracket with a cover, and put the rest of the filters higher up above where they originated.

Here's a few pics to detail it all.

Evap freshly pulled from the tub:

Evap taken apart to assess what to deal with:

A chunk of 18 gauge from Home Depot bent, drilled, and trimmed to house everything. The square cut is to allow two tubes to go to and from the canister behind the rear seat. The notch and trim across the top is to accommodate the angles and curves of the tub:

The two filters put onto the bracket:

The bracket put into place under the rear corner:

Canister with bracket to hold it in place:

Final bracket with a cover to help protect everything:

Am thinking of adding another cover bracket to help guard the exposed tubes.

We'll see how it runs when I finally get back to the trails.

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Old 07-30-2008, 12:01 PM   #2
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Location: Louisiana
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Excellent! Thanks for sharing... I made a thread a few days ago asking what people were doing with the evap canister and LDP (the small pumps) when doing a comp cut. I think I'm going to try relocating it all in the tub though.

Thanks again,



Frank Bullitt (BULLZ)
April 2001 - Sept 2011
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Old 08-08-2008, 03:19 PM   #3
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what size diameter hoses did you use? 5/8" and 5/16"?

and does the smaller hose that use used in the following photo... does that go to the gas tank... and did you ditch the hard plastic line altogether that used to be attached to the LDP?

and what did you do with these grey hard plastic pieces? Are you still using them?

Thanks in advance,


Frank Bullitt (BULLZ)
April 2001 - Sept 2011
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Old 08-09-2008, 11:47 AM   #4
Join Date: Mar 2008
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Ok, dump question, what does the evap canister do? I mean I can guess from the name, but what/why exactly?
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Old 08-09-2008, 11:51 AM   #5
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instead of releasing gas vapors into the air they are colected in the charcoal canister and then later are purged into the intake to be burned off.
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Old 08-09-2008, 02:50 PM   #6
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John and I removed that from the jeep yesterday. I took it home to think about what to do with it. I've read on other forums that some people remove the canister from the LDP assembly and that cuts down on ALOT of the bulk.

So I seperated the canister from the LDP and brackets and the LDP stuff itself is pretty small.

canister & ldp...

ldp assembly by itself...

so now I think I can simply run a closed loop, omitting the canister, so that the leak detection stuff doesn't throw any codes when it pressurizes the lines. And the LDP stuff is so small I can easily use 3 or 4 sheet metal screws to attach it to inside the tub (no custom brackets or anything) and extend the lines maybe 12" or so to the connections outside in the fenderwell.

THen when I get the stretch done and move the fuel tank inside the tub I can either keep the LDP where I've put it or relocate it again if necessary.

Frank Bullitt (BULLZ)
April 2001 - Sept 2011
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Old 02-24-2012, 09:56 PM   #7
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sorry this is an old thread but its about the best I've read about not throwing codes and getting rid of the canister. how exactly did you bypass the canister?

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