The big can is a liquid check valve. There's a float inside that will close it off if it fills up. The small one is a rollover check valve. There's a ball inside that will close it off if flipped upside down.
The single line will go from the rollover valve to the charcoal canister in the engine compartment. That gets hooked into a vacuum source.
While not 100% necessary, it eliminates alot of fuel odors. My hose is just looped as you started, but I am planning on hooking everything up. I have all of the parts to do it, just need to make time.
I have a constant smell of gas around the Jeep, it get old after awhile.
The first step is to determine if the valves pictured actually work. The big one can be carefully opened up. It's just an O ring seal, a float inside, and thats about it. The smaller one can be visually checked, they usually rust apart, and blown through while flipping it to see if it works or not.
FWIW...neither part is readily available anymore. It takes some piecing of parts to make the setup work. If you remove them, don't toss them in the trash if they are good.
Aha! Not entirely true - the big one (which is usually pretty serviceable) can't be found anywhere. The smaller one - the rollover valve - can be found at delorean.com. Yes, that Delorean. http://store.delorean.com/p-6703-roll-over-valve.aspx It's an exact fit :thumbsup:
Just be sure if you do the loop to get a vented gas cap. You dont want the pressure to build up.
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