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You can leave the frequency valve in place. It is normally open. You may have to adjust the idle CO later, but it will run with it as is, assuming everything else in the CIS is OK.
The canister is someone's attempt to replace the fuel filter, I think. Can you trace the hoses and see if one is connected to your rear fuel pump? If so, I would get ride of those hose clamps and go back to the original hoses and filter pronto before you start a carbeque.
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