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Home >> Honda >> 1982 >> Prelude Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Evaporative Emissions System >> Testing >> Two-Way Valve

Two-Way Valve

  1. Remove gas cap and disconnect fuel vapor hose from liquid/vapor separator. Attach vacuum pump with gauge reading from 0-4 in. (0-100 mm) Hg. Slowly draw vacuum while observing gauge.
  2. Vacuum should stabilize at 0.2 - 0.6 in. (5-15 mm) Hg as 2-way valve opens. Reverse pump and gauge connections and slowly pressurize vapor hose. Pressure should momentarily stabilize at 1.0-2.2 in. (25-55 mm) Hg on Accord and Prelude models or 1.4-2.8 in. (35-70 mm) Hg on Civic models. If not, check hose connections or replace valve.
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