ACIS Vacuum Tank (GS400, LS400 & SC400)

Disconnect vacuum hoses from vacuum tank. Vacuum tank is located under front of intake manifold. See Figure-6. Apply compressed air to port "A". See Figure. Air should flow out of port "B". Apply compressed air to port "B". Air should not flow out of port "A". Plug port "B". Apply 11.8 in. Hg to port "A". Vacuum should hold for at least one minute. If ACIS vacuum tank does not operate as specified, replace ACIS vacuum tank. If ACIS vacuum tank operates as specified, go to next procedure.