Firebird V8-305 5.0L (1982)
Bowl Vent Valve: Testing and Inspection
1. Disconnect carburetor bowl vent vapor hose.
2. Apply vacuum to hose--using hand-held vacuum pump--and note gauge reading. Reading should not be more than 0.5 inches Hg.
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If vacuum is greater than specified, check for plugged hose or canister filter.
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If reading remains high, replace vacuum canister.
3. With engine idling--at normal operating temperature--apply vacuum to vapor hose. The line should be blocked and a high vacuum reading should
be obtained.
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If line is not blocked, remove vacuum line from canister and check for vacuum.
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If no vacuum is available, repair line.
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If vacuum is available, replace canister.
