LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 1981 >> Prelude Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Evaporative Emissions System >> Testing >> Two-Way Valve
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Two-Way Valve

  1. Remove gas cap and disconnect fuel vapor hose from liquid/vapor separator. Attach vacuum pump with gauge reading from 0-5 in. Hg. Slowly draw vacuum while observing gauge.
  2. Vacuum should stabilize at 0.2 - 0.6 in. Hg as 2-way valve opens. Reverse pump and gauge connections and slowly pressurize vapor hose. Pressure should momentarily stabilize at 1.4-2.8 in. Hg as 2-way valve opens. If not, check hose connections or replace valve.
scientia non olet · About LEMON Manuals