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Unread 05-05-2009, 06:13 PM   #1
armedsks
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fuel tank vent problem

My fuel tank has 2 vent tubes comming off of it on the drivers side. Currently the way it is they are tied off together by the PO. I notice on my buddys Cj his go to a black module, then go to the evap canister.

My black module is gone but my evap canister(un hooked) is still there. Im pretty sure the tubes need to go some to vent, right?? Or is it ok to leave them capped

When i fuel up my tank lets out some pressure, when i open the gas cap.

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Unread 05-05-2009, 06:17 PM   #2
keith460
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The two vent lines should go to the factory liquid check valve as pictured.

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Unread 05-05-2009, 06:27 PM   #3
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Unread 05-05-2009, 06:41 PM   #4
armedsks
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ok thanks for the pics. Im missing the liquid check valve and rollover check valve. Only thing i have left is a capped off line going to the evap canister. Basicly all the emissions was hacked out. What would be the best way to do something with the 2 vent lines??
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Unread 05-06-2009, 09:55 AM   #5
83cj8
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Fuel lines

I don't have my jeep right now because I am overseas. If I remember right one of the vent lines should go to the evaporative cannister. You may want to look up which of the four ports (in the cannister) that line should run into. The second vent line should run to the "out" side of the fuel filter. Your fuel filter should have two ports on one side of it; one goes to the carb and the other to the vent on the gas tank. This lets the psi above the recommended 4psi (I think) run back into the gas tank so that line is not really a vent but a return line from the fuel filter.

Hope this help.
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Unread 05-06-2009, 04:46 PM   #6
bigirons79CJ5
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My roll over check valve was a rusty hunk when I bought my jeep and was not hooked up and the canister up front was gone. I capped one of the tubes coming from the tank. The other tube I hooked a new piece of fuel hose to it, routed it up by the tail light and put a chevy fuel filter on it. According to legend: the fuel filter will let the tank vent properly and act as a check valve to prevent water from entering and fuel from sloshing out.
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Unread 05-06-2009, 07:44 PM   #7
armedsks
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ok thanks i will try that.... easy enough to find a fuel filter!!
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Unread 05-06-2009, 07:50 PM   #8
thantos858
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Just buy the check valves they do more than just stop fuel from sloshing out. A fuel filter will let it all run out when you roll it. I know there was a post on here not to long ago about the same subject.
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Unread 06-10-2009, 08:11 AM   #9
carter262
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Quote:
Originally Posted by keith460 View Post
The two vent lines should go to the factory liquid check valve as pictured.

Keith460

Where did you buy the rollover check valve and liquid check valve? I want to replace mine on an 82 CJ7 but am having trouble finding them.
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Unread 06-10-2009, 02:34 PM   #10
keith460
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The rollover check valve can be found here, if still available: http://www.delorean.com/store/p-6703...ver-valve.aspx

Don't know where you can get a liquid check valve as the one I have is my original from the factory.
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Unread 06-10-2009, 05:09 PM   #11
carter262
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Quote:
Originally Posted by keith460 View Post
The rollover check valve can be found here, if still available: http://www.delorean.com/store/p-6703...ver-valve.aspx

Don't know where you can get a liquid check valve as the one I have is my original from the factory.
Thanks,

Do you know if the liquid check valves go bad. I am redoing my 82' CJ7 and figured I would replace it since it is so old but can not find one. I have the original jeep part number but the dealership said that is is discontinued item.
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Unread 06-10-2009, 05:17 PM   #12
carter262
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Keith460 one more question.
What is this item and where does it go? Mine is cut off. I circled it in yellow on the picture.

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Unread 06-10-2009, 05:34 PM   #13
keith460
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You can separate the Check Valve by removing the top portion and clean and inspect to see if it needs any work. They usually do not go bad unless the plastic is broken or modified in some way.

The item circled is the rear brake hose in it's bracket, connected to the rear brake line.
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Unread 06-11-2009, 11:25 AM   #14
Stan99
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Sorry to high jack but do you need the roll over valve? Mine didnt have one to start with, it only had the check valve.
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Unread 06-11-2009, 12:26 PM   #15
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Stan99:

My 1976 CJ7 did not come with a factory roll over valve either, just check valve and the factory manual confirms this. However I think it is a good idea to add it just in case you do roll over, you do not want fuel spilling all over you after a wreck.

The roll over valve was added sometime after 1976.

Jim
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