ACIS Vacuum Tank (ES300, GS300 & SC300)

Disconnect vacuum hoses from vacuum tank. On ES300, vacuum tank is located at left side member, under battery tray. On GS300 and SC300, vacuum tank is located under air intake chamber. See Figure-6.
On ES300, apply compressed air to port "B". See Fig 1. Air should flow out of port "A". Apply compressed air to port "A". Air should not flow from port "B". Plug port "B". Apply 7.9 in. Hg to port "A". Vacuum should hold for at least one minute.
On GS300 and SC300, apply compressed air to port "A". See Fig 1. Air should flow out of port "B". Apply compressed air to port "B". Air should not flow from port "A". Plug port "B". Apply 15.8 in. Hg to port "A". Vacuum should hold for at least one minute.
On all models, if ACIS vacuum tank does not operate as specified, replace ACIS vacuum tank. If ACIS vacuum tank operates as specified, go to next procedure.

Fig 1: Identifying ACIS Vacuum Tank Ports