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Unread 05-10-2010, 07:38 PM   #1
guysnydr
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1983 CJ7 
 
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Charcoal Canister - to use or not to use?

Just wondered what everyones thoughts are on using the charcoal canister or not? I am swapping in a SBC and want to keep things simple. I've heard some say they don't bother with it at all and some say I should have it hooked up. I have no emmissions requirements to worry about so was kinda hoping not to use it but would like to hear some input, pros and cons. Thanks to you all.

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Unread 05-10-2010, 07:48 PM   #2
Fatman
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I'm running the coal can.
Still have not decided what I'll do about the fuel return line inlet on the tank.
Think I'm going to cap it. If I have any issues, I'll just run a vent.

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Unread 05-10-2010, 08:58 PM   #3
Trapshooter
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My understanding of the canister is to absorb fuel vapors that the carb emits after the engine is shut down. Keeps the gas smell at a minimum.

Maybe someone else can weigh in here as to the benefits of having the charcoal canister?
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Unread 05-10-2010, 09:11 PM   #4
KMD
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unless you like the smell of raw fuel then you will want to run the cannister.
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Unread 05-10-2010, 11:26 PM   #5
sevenlitre2002
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OK, all you Jeep guru's, answer me this:

If millions of Fords, Chevrolet's, Dodges, etc. built during the 60's and 70's ran fine without a gas tank vent line and charcoal canister, what makes AMC so special?
I've got a 360 in my 1983 CJ-7. Figured I'd keep it simple.
No cannister, no vent line and a normal fuel filter. (No return line)
The way I see it, if it worked all those years on every other make of car, it should work just fine
on a Jeep. 2 years since the engine swap and everything runs like a clock.
Am I missing something here?
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Unread 05-10-2010, 11:59 PM   #6
JayAllen
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to keep or not to keep

You should keep the coal can, it recycles fuel vapors back into the tank saving your gas. If u leave gas in an open can it will evaporate over time ,slowly but it does.
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Unread 05-11-2010, 06:12 AM   #7
Mike Romain
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The canister collects fumes from the gas tank and acts as the gas tank vent. It is a passive system in a way that doesn't affect performance. It also feeds a flow to the PCV system when you are at speed which balances it. The PCV system controls engine sludge and blowby. I suppose you could get a '60's PCV valve, but...

It also sends these gas fumes back to the engine to get reburned so it saves gas mileage also. Well, every little bit counts....

The old style cars used a vented gas cap so the gas tank wouldn't vaporlock when in use and could blow out fumes when sitting. Old cars always stunk like gas when you let them sit in the sun.

AMC used a modern sealed gas tank system. I know for sure when I plug up the $2.00 air filter on the bottom of my canister playing in the mud, a vacuum forms in my gas tank and the engine starves to the point of not running on the highway unless I crack open my gas cap.

I ran with just an open vent when my canister failed and we got bad raw gas fumes in our hair and clothes even.

AMC also got smart and used a return line off the top of the gas filter to blow vapor back to the tank when it gets shut down hot thus preventing vaporlock on a hot shutdown like a lot of old cars did.

I think these are good ideas and should be used.
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Unread 05-11-2010, 07:52 AM   #8
giddyupgo55
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I took mine out 25 years ago (77 CJ7 AMC360) never had a problem. The only gas smell I've had was when I had a leak in a fuel line. Always figured 13 mpg was doing good. This is just my take on things.
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Unread 05-11-2010, 08:38 AM   #9
CSP
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Quote:
Originally Posted by Trapshooter View Post
Maybe someone else can weigh in here as to the benefits of having the charcoal canister?
Maybe someone can weigh in as to the benefits of not having the canister.

Seriously, it's such a basic system to grasp and keeps fumes out of the atmosphere, so I don't understand how not having it makes any sense. The "simple" argument doesn't fly IMO. It takes all of five minutes to understand.
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Unread 05-11-2010, 08:48 AM   #10
misplacetexan
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My CJ5 is currently running fine without one. When I bought my CJ5, it was missing the canister and bracket. IMHO, if you already have the components, used them. If you still don't want to use them, I will be happy to them off your hands and intall them on my CJ5.
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Unread 05-11-2010, 03:23 PM   #11
Coiz
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Quote:
Originally Posted by Mike Romain View Post
The canister collects fumes from the gas tank and acts as the gas tank vent. It is a passive system in a way that doesn't affect performance... It also sends these gas fumes back to the engine to get reburned so it saves gas mileage also....

I think these are good ideas and should be used.


It is not a question of whether or not it runs better or worse if you do or don't have a canister, there are more benefits to having one than not. Mike nailed it! It acts as a vent, greatly reduces hydrocarbon emissions, stores your ~$3.20/g gas vapors to get burned at cruise and has no effect on performance.

Quote:
Originally Posted by CSP View Post
Maybe someone can weigh in as to the benefits of not having the canister.

Seriously, it's such a basic system to grasp and keeps fumes out of the atmosphere, so I don't understand how not having it makes any sense. The "simple" argument doesn't fly IMO. It takes all of five minutes to understand.
There are no benefits to not running one. You nailed it right on the head.
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Unread 05-11-2010, 04:59 PM   #12
DUX4LIFE
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Right now I wish I didn't have one on. I have lost about a gallon of fuel today through it. I parked it this morning after refueling and look down to see a huge puddle of gasoline on the floor. Now I need to do a search and find out why. I thought the vacuum lines were routed correctly.
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Unread 05-11-2010, 06:45 PM   #13
Coiz
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If the canister filled up with fuel while refueling you likely have a problem with the liquid check valve or you have something routed wrong.
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Unread 05-11-2010, 07:06 PM   #14
DUX4LIFE
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Not to hijack this thread but this is my 2nd fillup since the rebuild. It did not happen on the first fillup. This is the warmest day we had though I think. I am reasonably certain the stuff is routed correctly but maybe the lines got pinched or the valves stuck.
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Unread 05-11-2010, 07:57 PM   #15
ReconRabbit
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I'm running without one and no problems here. Only 1 line coming from the tank and it goes to the carb. No return lines, no vents. Runs just fine.
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