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Home >> Ford >> 1991 >> Explorer 4D Utility, RWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Air Injection >> Vacuum Reservoir

Vacuum Reservoir

When charged with 15-20 in. Hg vacuum, vacuum loss should not exceed .5 in. Hg in 60 seconds. If vacuum loss is faster, replace reservoir.