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Home >> Isuzu >> 1988 >> Pickup Base, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Component Testing >> Tank Pressure Control Valve >> I-Mark
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Tank Pressure Control Valve: I-Mark

  1. Remove hoses and remove valve. Apply 1.1-1.2 in. Hg to intake manifold vacuum port and blow air into fuel tank port. Valve should open and allow air to pass through canister port.
  2. Remove vacuum and blow through fuel tank port with canister port blocked. Air should pass through vacuum port. If valve does not perform as outlined, replace valve.
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