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.
78 CJ7.. 258.. TH400/Dana18.. SOA/stock YJ springs.. 35" General Grabbers.. Waggy 44s.. 4.88 gears...Spartan/Lockright...Fiberglass front to rear
That's what I bought. For about $30. If they even still have any left.
True, they have a limited supply of parts - all made for the original Delorean production run in the 80s and once they're gone, they're gone for good (unless you build your own Delorean and go back in time to buy them). The good news is they're made of plastic, unlike the original thin metal that rusts away like you mentioned. So hopefully they'll have a longer service life