A few questions for my 77 CJ. The other day I was poking around under the left rear corner, right underneath the taillight, and found what I would assume to be some sort of rollover valve/device/thingee (thingee is a technical term.) Does anyone know what I'm referring to? If so, what are the odds that it still works? If it doesn't work anymore, should I replace it with a new one, or just rip it out? Any advice would be appreciated. Thanks.

I don't think my CJ has anything there but my advise is, unless it's a problem, leave it alone. <img src="/forums/images/graemlins/cheers.gif" alt="" />

The YJ has a carbon canister in the passenger side rear corner. A tube comes out of the gas tank and up into the bottom of this 'thingy' and then another tube feeds out the top and goes up to the engine somewhere I think. Mine was broken and fallen inside the corner; it had ripped off the bottom part where it slips onto the tube comming from the tank. You can't buy it at the parts store if that is what it is. I just shoved it back on and clamped it best I could with what was left to grab.

I don't think they really fail a lot. Look in your manual and see if you CJ has such a device (not called "carbon canister" probably). Has to do with the emmisions system somehow. I figure if the truck runs and I don't smell gas then everything is fine.

You're referring to the vapor canister. I replaced mine a few months ago because the insides had somehow fallen out within the last year. The motor doesn't need it to run, but I like to have my emissions stuff working, what's left of it anyway, better for the environment. It's in the engine compartment underneath the master cyliner. The only reason I'm asking about this thing under my left taillight is because I'm going to be doing some work on my taillights soon and it will have to come out. And if it's not important, I'm just not going to put it back in. I'm just curious exactly what it is.

It is a valve that is supposed to prevent gas from escaping from the tank in the event of a rollover. My 76 cj5 had one and I rolled it twice and it worked, I think its some sort of a checkvalve. The thing the other guys are referring to is a charcol canister and its in the front left hand corner and is part of the emissions system.