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Old 04-16-2012, 06:51:37 PM   #1
siberbunak
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Charcoal canister. How to check it?

How should I make sure whether this part is okay ot not ?

It is a sealed box. It is impossible to open to have a look.

There is a filter element on the bottom that I've easily took out but nothing visible from that side either.
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Old 04-17-2012, 06:27:40 AM   #2
80WA7113
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Quote:
Originally Posted by siberbunak
How should I make sure whether this part is okay ot not ?

It is a sealed box. It is impossible to open to have a look.

There is a filter element on the bottom that I've easily took out but nothing visible from that side either.

There is no "official" check in the GM service manual. You can not open it without ruining it.

The canister is filled with activated charcoal and used to capture fumes from the fuel tank that would otherwise be vented to the atmosphere, and route them to the carb.. They don't clog. If it's not cracked and leaking charcoal, it's good. The only maintenance they ever require is to periodically change the filter element on the bottom.

If yours has a purge valve on top, (small line to ported vacuum on the carb) you can check the operation by using a vacuum pump and putting 15hg of vacuum to it. If it holds for 20 seconds, it's operating normally.
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Old 04-17-2012, 07:17:22 AM   #3
siberbunak
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Thank you Dave.

On that canister there is only an inlet and one outlet. No valve.
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Old 04-17-2012, 08:21:31 AM   #4
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You're welcome!

With just the TANK and CARB nipples yours has no moving parts to fail, so you're good to go! GM started using that style canister in 1974, and I believe it was used through 1977, with the reintroduction of the vacuum purge valve in 1978.
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