2-Way Valve
- Remove fuel filler cap. See Fig 1
. Remove vapor hose from fuel tank side of 2-way valve, and install "T" fitting. Connect vacuum gauge to "T" fitting and vacuum pump to hose end.
- Slowly apply vacuum while observing vacuum gauge. Vacuum should stabilize momentarily between .2 and .6 in. Hg. If vacuum does not stabilize (valve opens) in specified range, replace 2-way valve and retest.
- Move vacuum hose from vacuum to pressure fitting side of vacuum pump. Slowly pressurize vapor line while observing gauge. If pressure stabilizes between .4 and 1.4 in. Hg, valve is okay. If pressure does not stabilize in specified range, replace 2-way valve, and retest.
Courtesy of AMERICAN HONDA MOTOR CO., INC.