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Home >> Honda >> 1993 >> Prelude VTEC >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Emission Systems & Sub-Systems >> Fuel Evaporation >> 2-Way Valve
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2-Way Valve

  1. Remove fuel filler cap. Disconnect vapor hose from fuel tank side of 2-way valve, located in fuel tank area. Install "T" fitting into hose. Connect vacuum gauge and vacuum pump to "T" fitting.
  2. Slowly apply vacuum while observing vacuum gauge. Vacuum should stabilize momentarily at 0.2-0.6 in. Hg. If vacuum is as specified, go to next step. If vacuum is not as specified, replace 2-way valve. Retest system.
  3. Move vacuum hose from vacuum to pressure fitting side of vacuum pump. Slowly pressurize vapor line while observing 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 valve and retest.
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