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Unread 05-11-2010, 09:08 PM   #16
DUX4LIFE
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1977 CJ7 
 
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Quote:
Originally Posted by nzirbel View Post
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.
Is it the breather from the tank? Where does it go on the carb?

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Unread 05-11-2010, 09:11 PM   #17
ReconRabbit
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1983 CJ7 
 
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My single line is the fuel line. No breathers, canister, vents, nothing.
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Unread 05-12-2010, 05:55 AM   #18
Mike Romain
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Quote:
Originally Posted by DUX4LIFE View Post
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.
That usually indicates a stuck float needle. this allows gas to overflow the carb float bowl and run down the vent line to the canister and right out the bottom.

The gas tank vent lines should have a liquid check valve on them to prevent gas from filling to get up the line to the canister. My 20 gallon ones are built into the tank, 15 gallon ones are external.
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Unread 05-12-2010, 06:05 AM   #19
DUX4LIFE
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Quote:
Originally Posted by Mike Romain View Post
That usually indicates a stuck float needle. this allows gas to overflow the carb float bowl and run down the vent line to the canister and right out the bottom.

The gas tank vent lines should have a liquid check valve on them to prevent gas from filling to get up the line to the canister. My 20 gallon ones are built into the tank, 15 gallon ones are external.
That sounds likely since at the time it was leaking the distributor vacuum and the pvc lines were disconnected from the cannister. only the carb bowl and the fuel tank were connected. It stopped now so I will let it ride and see what comes of it. I fixed the broken nipple on the vacuum line and got the length of tubing for the pvc line. Checked the pvc and it is fine. Thanks
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Unread 05-12-2010, 08:27 AM   #20
RobsCrawlin7
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my 79 doesnt have one anymore either, i sealed it all up and have a vented gas cap.
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Unread 05-12-2010, 10:05 AM   #21
twmattox
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FYI, these purge at two different levels. There is a primary purge (which operates only at idle). A secondary larger purge opens when the purge signal is opened with ported vacuum (so operates at off idle to wide open throttle).

A couple of things most people don't think about with these is that the carburetor was jetted to operate with it. Basically, these function as an air bleed (adding air) to the intake. So, the carburetor is jetted rich to compensate. So, remove the charcoal canister and retain the stock carb...and you will run rich.
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Unread 10-17-2010, 09:06 PM   #22
ckid222
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Quote:
Originally Posted by ReconRabbit View Post
My single line is the fuel line. No breathers, canister, vents, nothing.
Does any one have a diagram or know of where the fuel line exactly runs? Mine is busted and Id like to repair it.

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Unread 10-17-2010, 10:23 PM   #23
ChaseB
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We call em pond filters down here, mine was removed years ago and it's not going back
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Unread 01-05-2014, 12:03 AM   #24
gordon1970
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1979 cj7 258 inline 6

im a brand new jeep owner and im trying to figure out the horrible gas fumes from the exhaust and extremely bad gas mileage on my 1979 258 inline 6. idles and seems as tho it runs good, p.o had vacuum lines a mess. I have a front and rear cto and neither are hooked to anything. can somebody direct me on what to do? I did put new plugs in....
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Unread 01-05-2014, 06:56 AM   #25
Matt1981CJ7
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Quote:
Originally Posted by gordon1970 View Post
im a brand new jeep owner and im trying to figure out the horrible gas fumes from the exhaust and extremely bad gas mileage on my 1979 258 inline 6. idles and seems as tho it runs good, p.o had vacuum lines a mess. I have a front and rear cto and neither are hooked to anything. can somebody direct me on what to do? I did put new plugs in....
Here's what your vacuum layout looked like from the factory.

Hope this helps,

Matt
79-fsj-6cyl_vacuum-2.jpg  
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Unread 01-06-2014, 11:02 PM   #26
Colt44
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Having done the 4.0 headswap on my '83, I just went through this. I left the canister unconnected on the first go-round, and although the engine worked fine, I did often have the lingering and not so subtle aroma of raw gasoline billowing around the Jeep whenever it was parked. On hot days after a fillup, as the cold fuel fresh from the underground tank warmed up in my gas tank, I would sometimes even find fuel spots on the ground.
The plumbing is a little simpler for the MPFI setup, so I went back to the junkyard and pulled the cannister and plumbing from the '91 Wrangler donor. After hooking it up, all those fumes go into the intake instead of the atmosphere, and all the gas I pay for gets burned. No more gasoline stench, and no more dripping fuel. Don't have to worry about pressure differential between my gas tank and ambient. MPG went up a tad. I'm not a big environmentalist by any means, but it's nice to know I'm not polluting when I don't have to be.

My advice is, hook it up.
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