FixVault
Home › Honda › 1991 › Civic Base, 2D Hatchback › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests › Emission Systems & Sub-Systems › Fuel Evaporation › 2-Way Valve

2-Way Valve

  1. Remove fuel filler cap. Remove vapor hose from fuel tank side of 2-way valve, and install "T" fitting. Connect vacuum gauge to "T" fitting and a vacuum pump to end of hose.
  2. Slowly apply vacuum while watching vacuum gauge. Vacuum reading should stabilize momentarily at 0.2-0.6 in. Hg. If reading is as specified, go to next step. If vacuum stabilizes (valve opens) at less than 0.2 in Hg or greater than 0.6 in. Hg, replace 2-way valve, and retest.
  3. Move vacuum hose from vacuum to pressure fitting side of vacuum pump. Slowly pressurize vapor line while watching gauge. If pressure stabilizes at 0.4-1.4 in. Hg, valve is okay. If pressure stabilizes at less than 0.4 in. Hg or greater than 1.4 in. Hg, replace 2-way valve, and retest.
About FixVault