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Old 03-03-2011, 06:28 PM   #1
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drilled a hole in my ????

I recently put some rear corner guards on my Jeep LJ. As I was drilling the holes for the rivets I accidentally drilled a 3/16" hole into a gray oblong canister located behind the rear passenger wheel wheel. The check engine light has come on and AutoZone told me their reader "showed emissions and is probably the gas cap". Further inspection revealed the above issue instead. Does anybody know what this is and exactly what it does? It looks difficult to replace, so I hope to just patch the small hole and move on. The Jeep has been running normal. I know my previous YJ didn't have one of these.
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Old 03-03-2011, 06:34 PM   #2
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That would be the evap canister. It's purpose is to store gasoline vapors from the tank until you start the engine, at which time the vapors get pulled into the engine and burned-off, rather than get vented to the atmosphere. It's part of the emissions system.

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Old 03-03-2011, 06:45 PM   #3
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Makes sense. Do you think I could seal that hole or will it need to be replaced?
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Old 03-03-2011, 06:50 PM   #4
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Worth a try. Worst that can happen is you have to replace it anyway.
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Old 03-03-2011, 06:52 PM   #5
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I would simply silicone a small piece of plastic as a patch over the hole. The check engine light is probably just from a vacuum leak as a result of the hole.
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Old 03-04-2011, 07:24 AM   #6
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I would simply silicone a small piece of plastic as a patch over the hole. The check engine light is probably just from a vacuum leak as a result of the hole.
+1 or just mix some JB Weld and seal it with it.
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Old 03-04-2011, 07:44 AM   #7
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i agree with the j b weld. get the 4 minute cure stuff. i use it alot and the stuff works great for alot of things!
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Old 03-04-2011, 08:13 AM   #8
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PC-7 ,silicon , JBweld if they don't stick try polyurathane epoxy found at home depot as jerry said try the silicon, use the red its gas resistant ,clear ,blue and black just don't cut it
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Old 03-04-2011, 09:02 AM   #9
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you can seal that up with pretty much anything, even duct tape would work for a while (or longer if you use good stuff). The canister only sees mild vacuum.
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Old 04-21-2011, 06:19 PM   #10
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Still having CEL issues. After I have slid the evap canister out and sealed the hole and reset the CEL, I am getting a P0440 code. I am beginning to wonder if the drill might have damaged something inside the canister causing vacuum problems. Anybody ever looked inside the canister to see what kind of components are in there?

Also, any suggestions on how to proceed from here? Should I replace the canister...bypass it...or what?

I am pretty sure my problem lies with the evap canister because the CEL came on right after I drilled a hole in it and I just replaced my gas cap.
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Old 04-21-2011, 06:35 PM   #11
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i agree with the j b weld. get the 4 minute cure stuff. i use it alot and the stuff works great for alot of things!

x2 Fixed my doors with it
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Old 04-21-2011, 09:36 PM   #12
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Still having CEL issues. After I have slid the evap canister out and sealed the hole and reset the CEL, I am getting a P0440 code. I am beginning to wonder if the drill might have damaged something inside the canister causing vacuum problems. Anybody ever looked inside the canister to see what kind of components are in there?

Also, any suggestions on how to proceed from here? Should I replace the canister...bypass it...or what?

I am pretty sure my problem lies with the evap canister because the CEL came on right after I drilled a hole in it and I just replaced my gas cap.

I saw that you cleared the code, but you could try resetting the ECM. Maybe the code is still there from before the hole was drilled.
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Old 04-22-2011, 06:32 AM   #13
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How do you reset the ECM?
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Old 04-22-2011, 06:57 AM   #14
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Never mind. I found this PCM Adaptive Memory clear or ECU reset TJ - Pirate4x4.Com Bulletin Board and reset it. I will try this first before I replace the evap canister. This also happened around the time that I removed a body lift. When I was reinstalling the fuel filler hose back onto the gas cap assembly I noticed that there is a vacuum hose strapped to the filler hose. The screw on top of it seems loose. Could this be leading to the problem? I will probably wait and see how the ECU reset turns out before I do anything else.

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