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Home >> Honda >> 1983 >> Prelude Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Component Testing >> Two-Way Valve

Two-Way Valve

  1. Remove gas cap and disconnect fuel vapor hose from liquid/vapor separator or vapor hose from fuel tank on Prelude. 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 .2-.6 in. 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. Hg. If not, check hose connections or replace valve.
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