Air Cleaner Cap Sub-Assembly (ES300)
Cover port "C" with finger, and check that air flows from port "B" to port "A". Cover port "C" with finger, and check that air does not flow from port "A" to port "B". Cover port "A" and "C" with fingers, and apply 18 in. Hg (60 kPa) of vacuum to port "B", and check that there is no change of vacuum after one minute. See Fig 1.