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post #1 of 13 Old 01-01-2013, 10:39 AM Thread Starter
jwing
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Fuel tank switch

I switched my gas tank from a 20 gallon to a 15 and the new 15 gallon tank doesn't have valve for the vapor line like the 20 gallon tank did. Do I need a valve like this for emmisions reasons or can I do without it. Thanks in advance for any help.

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post #2 of 13 Old 01-01-2013, 10:41 AM
Mean Max
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Not all years are the same. Need some vehicle profile info.

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post #3 of 13 Old 01-01-2013, 11:07 AM
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Please fill out your profile. Its not just for bragging rights. If you need tech info, thats the first place people look to see what your working with.


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If it has tracks, tires or tits, its gonna cause a problem.

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post #4 of 13 Old 01-01-2013, 11:34 AM Thread Starter
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Alright I updated my profile with the basic info but I'll just tell you on here too, it's an '87 yj with a 6 cyl 258ci 4.2 liter. The original 20 gallon tank that was in there when I bought it has a valve for the vapor line but the replacement 15 gallon tanks doesn't.
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post #5 of 13 Old 01-02-2013, 12:30 PM
Que89YJ
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Are you talking about the vent line or the purge line. The right side of the tank has to "outlets" one is the fill the other is the vent. The purge is on the oposite side of the tank. The purge is for emissions only and not necessary.
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post #6 of 13 Old 01-03-2013, 08:51 PM Thread Starter
jwing
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If the purge line is the one that connects to the charcoal canister than I'm talking about the purge line.
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post #7 of 13 Old 01-04-2013, 11:26 AM
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You can run without it. It might smell a little but it will run. The purge grabs the vapors. It sounds like you got a CJ tank. Why not go with the poly tank. They are easy to find and cheap. The 91-95 polytanks are a bolt in to out earlier jeep. You had a 20, was it a poly?
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post #8 of 13 Old 01-07-2013, 02:20 PM Thread Starter
jwing
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No idea if it was a poly or not but the tank i got was like $65. The sending unit on the old one was broken so it was either a new sending unit or a new tank. I needed new gauges anyway so I went with new tank because the gauges I got came with the senders. Should I just cap off the purge line if I don't need it then? Or can I make a hole and put in a valve if I don't want it to be all smelly.
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post #9 of 13 Old 01-07-2013, 03:29 PM
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You can just cap it and see how it works. Too bad you got the steel. The poly tank can be found everywhere off of the 91/95 and you wouldn't have to lose capacity like the steel tank.

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post #10 of 13 Old 01-07-2013, 05:39 PM Thread Starter
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My old tank was steel too plus the fuel senders for the old tank costs more than the new tank anyway.
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post #11 of 13 Old 01-07-2013, 06:49 PM
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My old tank was steel too plus the fuel senders for the old tank costs more than the new tank anyway.
http://www.mtscompany.com/jeep.htm

$24.99, if I remember correctly.



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post #12 of 13 Old 01-07-2013, 08:41 PM Thread Starter
jwing
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The one on mine had a big oval plate on it.
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post #13 of 13 Old 01-07-2013, 08:47 PM Thread Starter
jwing
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Thanks for that website Max i could for the life of me find a filler hose or vent hose to fit a 15 gallon tank.
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