Charcoal Vapor Canister Filling Issue - Hyundai Forums : Hyundai Forum
 
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#1 Old 10-09-2011, 06:50 PM
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Charcoal Vapor Canister Filling Issue

So I have a very similar story as this poster:

Can't Fill Up Gas Tank - Inspected Charcoal Canister, Removed Restrictions In Lines Already

"I did some research and learned that there could be charcoal pellets in the venting lines coming from the charcoal canister."
here are some of my differences:

• I have a 2000 Hyundai Accent

• I NEVER over fill my tank, once the auto shutoff kicks in I'm done filling my tank.

• Haven't had any error codes with this, yet.

• This started about 1-2 months ago.

• I have only found charcoal pellets in one of the tubes the 3/4 hose coming down from the filler neck.

• After removing those pellets I can fill normally.

If I add a small screen to cover the hole that the pellets are dropping from am I just putting a bandage on a real problem or actually fixing the issue?

What would cause these pellets to start leaking down and out of this hole now? Are they always in this area?

I read somewhere that if the vapor canister isn't in proper working order charcoal particles or dust particles can be introduced into the engine. Is this true?

Ultimately should I just get a new charcoal filter?

Thank you for any help!
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#2 Old 10-09-2011, 07:05 PM
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The real fix is to replace the canister, the purge valve, maybe the canister valve, and blow out all the lines. It's cost prohibitive. It's all up to you. Personally, I just leave the tank line disconnected, and have a cel all the time. Problem solved.

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#3 Old 10-09-2011, 07:09 PM
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Quote:
Originally Posted by jsinton View Post
The real fix is to replace the canister, the purge valve, maybe the canister valve, and blow out all the lines. It's cost prohibitive. It's all up to you. Personally, I just leave the tank line disconnected, and have a cel all the time. Problem solved.
I prefer not vent the vapors into the atmosphere, just seems irresponsible. I'm still looking to for the answers to my other questions if anyone else has some input.
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#4 Old 10-10-2011, 08:09 PM
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Anyone else have any insight on my questions?
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#5 Old 10-10-2011, 09:51 PM
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There is a very thorough explanation and how-to for diagnosis here:
Slow Fuel Fill Problem Diagnosis - Hyundai Forum - Hyundai Enthusiast Forums

Only the canister has charcoal pellets in it; any you find in hoses has come from the canister.

Jim
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#6 Old 10-10-2011, 10:19 PM
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Quote:
Originally Posted by Barnyspup View Post
There is a very thorough explanation and how-to for diagnosis here:
Slow Fuel Fill Problem Diagnosis - Hyundai Forum - Hyundai Enthusiast Forums

Only the canister has charcoal pellets in it; any you find in hoses has come from the canister.

Jim
That is the post where I gained most of my information about my issue. Very good read if you have a similar issue.


These are the questions I'm looking for answers to. I'm one of those people who likes to know why and how it works.


-If I add a small screen to cover the hole that the pellets are dropping from am I just putting a bandage on a real problem or actually fixing the issue?

-What would cause these pellets to start leaking down and out of this hole now? Are they always in this area?

-I read somewhere that if the vapor canister isn't in proper working order charcoal particles or dust particles can be introduced into the engine. Is this true?

Last edited by klekampcd; 10-10-2011 at 10:22 PM.
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#7 Old 10-12-2011, 05:06 AM
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Quote:
Originally Posted by klekampcd View Post


-If I add a small screen to cover the hole that the pellets are dropping from am I just putting a bandage on a real problem or actually fixing the issue?
Depends on how you look at it. The canister is just a can of charcoal pellets with a permeable membrane. The tank was overfilled and "gas-logged" the charcoal, it swelled up, membrane ruptured, thus charcoal pellets fall out. Putting a screen to hold in the pellets is actually a pretty good fix and works well... until you overfill again.

Quote:
Originally Posted by klekampcd View Post

-What would cause these pellets to start leaking down and out of this hole now? Are they always in this area?
Membrane is ruptured, not rocket science here.

Quote:
Originally Posted by klekampcd View Post

-I read somewhere that if the vapor canister isn't in proper working order charcoal particles or dust particles can be introduced into the engine. Is this true?
Pellets will foul up the purge valve again and again until problem is addressed. Otherwise there's not a problem.

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#8 Old 10-14-2011, 07:19 PM
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Thanks for the follow up! I'm not entirely sure how it was overfilled, because like I said, I don't add any gas after the auto shutoff kicks in. My only guess is that it was one of the gas stations I don't normally visit was broken or malfunctioning. Either way I will replace it eventually, I'll try the screen fix for now, and fix when I feel the patch isn't working accordingly any more.

Quote:
Originally Posted by jsinton View Post
Depends on how you look at it. The canister is just a can of charcoal pellets with a permeable membrane. The tank was overfilled and "gas-logged" the charcoal, it swelled up, membrane ruptured, thus charcoal pellets fall out. Putting a screen to hold in the pellets is actually a pretty good fix and works well... until you overfill again.



Membrane is ruptured, not rocket science here.



Pellets will foul up the purge valve again and again until problem is addressed. Otherwise there's not a problem.
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#9 Old 11-14-2011, 12:49 PM
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Idea

I recently replaced mine with an assembly I pulled from a salvage yard for $15. What I found when I replaced mine was pieces of charcoal plugging up the purge valve. When I turned the charcoal filter upside down, pieces started falling out left and right. I would check the local salvage yards, especially if you can pull yourself. If you can get charcoal to come out of the filter- no good. But if it doesn't, you might be easily in luck. I'd pull off the purge valve with it and replace in one fell swoop.
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