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.
- If vacuum is greater than specified, check for plugged hose or canister filter.
- 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.
- If line is not blocked, remove vacuum line from canister and check for vacuum.
^ If no vacuum is available, repair line.
^ If vacuum is available, replace canister.