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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.
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