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Originally Posted by The WidowMaker
could you expand a little. im not up to date on how all of these work. it sounds like the factory solutions may be pretty simple but im not completely following.
my previous thought was to do as pictured above with a very small tank (~1 qt) mounted up higher than the main tank. i would then have two main tank vents plumbed into the smaller vent tank; one line plumbed into the bottom from the filler neck and one into the bottom from the main tank. this small tank would then be vented out the top.
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If you look under the hood of a 1988 to about 1997 or so Chevy truck you will see a coffee can canister behind the left front headlight. It has a couple of lines on it. One is the vent coming from the gas tank. Another goes to the intake - and I can't remember where the third one goes. Anyway, on my 69 Vette aka Killer - I used one of these and hooked the vent line from the tank to the can. The can acts like a big air filter that not only allows pressure to come off the tank and get scrubbed to remove the gas odor, but it also allows the tank to breath in through the valve on the top of the unit. I like what 70rs says about looking at the Chilton diagram and just hooking it up.
On my LS set up, I simply duplicated the vacuum lines off the 1996 Caprice tank to a 2002 or so style full size truck charcoal can. These are square shaped and are found on the driver side under the bed behind the cab. You can get them from the bone yard cheap or nearly free. Nobody really wants them for anything. They have a valve you have to get that will hook to your LS wire harness for the purge. You will want to run the vacuum line back up to the engine just at the LS does from the factory. I was able to tuck the unit on the right frame rail by the tank on the Camaro.
I see no reason why you couldn't hook one of these up to a Ricks or other tank - as long as the vent on the tank is sufficient to begin with.
The 68 Firebird we are building right now has a stock tank and stock vented cap. Man...I had forgotten what a pain the gas vapors can be. We were out there working last night - Camaro and Firebird side by side in the shop. When the sun sets and the garage door is open that heats the rear of the cars and you really pick up some odor out of the Firebird - the Camaro is just like a new car - no odor at all...facing the same exact circumstances.
It is worth looking into.