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Home >> Chevrolet >> 1988 >> Spectrum Express >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Component Testing >> 2-Way Check Valve
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2-Way Check Valve

  1. Remove 2-way check valve from vapor line and note color coded ports. Connect a new piece of hose to Orange valve port (canister side). Slowly blow air into hose and check that air flows out of Black port (fuel tank side).
  2. Remove hose from valve and connect hose to Black valve port (fuel tank side). Slowly blow air into hose and check that air flows out of Orange port. Replace valve if it does not operate as outlined.
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