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Old 02-22-2008, 08:10 PM   #1
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Default Check valve on charcoal canister

First of all what does it do and do I need to put a checkvalve on its vacuum line?
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Old 02-22-2008, 08:16 PM   #2
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emmissions.

without the check valve, if the solenoid opens and you are boosting, your boost goes through the canister and into the atmosphere and fuel tank.
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Old 02-22-2008, 08:23 PM   #3
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Quote:
Originally Posted by Braineack View Post
emmissions.

without the check valve, if the solenoid opens and you are boosting, your boost goes through the canister and into the atmosphere and fuel tank.
Emissions in what way? Exactly. What does it cleanse?

Also, where do I get the check valve, any specific name for it?
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Old 02-22-2008, 08:30 PM   #4
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It is the fuel tank vent iI believe. Burns off vapors at high vac.
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Old 02-22-2008, 08:32 PM   #5
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Can it be routed to the compressor inlet tube (since there's always a vacuum here)?
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Old 02-22-2008, 08:41 PM   #6
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Quote:
Originally Posted by The_Pipefather View Post
Can it be routed to the compressor inlet tube (since there's always a vacuum here)?
There is no vacuum there.
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Old 02-22-2008, 09:11 PM   #7
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Quote:
Originally Posted by Saml01 View Post
There is no vacuum there.
there's some vacuum there because of the air filter...maybe 1-2~hg.

i think its simply easier to put a check valve on the line, that or ripping it out.

Quote:
Originally Posted by neogenesis2004 View Post
It is the fuel tank vent iI believe. Burns off vapors at high vac.
yep. there's a line that goes straight to the top of the fuel tank and a line to the solenoid.

in high vacuum the solenoid opens and it sucks the fuel vapors into the IM to burn off.
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Old 02-22-2008, 09:28 PM   #8
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But is it worth keeping?
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Old 02-22-2008, 09:46 PM   #9
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any pictures on this? i am a visual learner what can i say.
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Old 02-22-2008, 10:22 PM   #10
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any pictures on this? i am a visual learner what can i say.
Open your hood and look for the large black metal cylinder on the left side near the headlight motor.
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Old 02-22-2008, 10:38 PM   #11
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It's worth keeping. Doesn't reduce performance with it intact, but will reduce gas odors and vapors. Just get a cheapie check valve at Autozone or somewhere.
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Old 02-23-2008, 12:49 AM   #12
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Quote:
Originally Posted by Saml01 View Post
Open your hood and look for the large black metal cylinder on the left side near the headlight motor.
no motor here but i would like to know at which hose to install the valve.
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Old 02-23-2008, 01:04 AM   #13
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The only one going to the charcoal cannister from the intake.
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Old 02-23-2008, 12:18 PM   #14
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Quote:
Originally Posted by Braineack View Post
in high vacuum the solenoid opens and it sucks the fuel vapors into the IM to burn off.
So wait. Is it normal that sometimes when I go to fill up, when I crack open the fuel cap it sounds like I opened a seltzer bottle?
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Old 02-23-2008, 12:53 PM   #15
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Yes, that's normal.
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Old 02-23-2008, 01:56 PM   #16
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can you take the whole canister out? if so isnt there a sensor going to it?
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Old 02-23-2008, 02:03 PM   #17
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Quote:
Originally Posted by furian777 View Post
can you take the whole canister out? if so isnt there a sensor going to it?
You can take the entire charcoal cannister system out. There is a map sensor, solenoid and the cannister itself. When you remove it all you just cap off the intake port and make sure that the vent goes somewhere besides in your engine bay afterwards. Don't want a fire hazard because you're venting the gas tank into your engine bay.
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Old 02-23-2008, 04:31 PM   #18
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i just binned my charcoal can and ran the vent pipe into the subframe
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Old 02-23-2008, 08:01 PM   #19
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What are people with standalones doing? There is no talk anywhere about controlling that solenoid with megasquirt or any other EMS.
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Old 02-23-2008, 09:01 PM   #20
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Quote:
Originally Posted by The_Pipefather View Post
What are people with standalones doing? There is no talk anywhere about controlling that solenoid with megasquirt or any other EMS.
I dont think the computer controls it. I would imagine it would be just a map sensor triggering a solenoid.
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