EVAP Two Way Valve Test
Move the vacuum pump from the vacuum fitting to the pressure fitting (A) as shown.
Slowly pressurize the vapor line while watching the gauge. The valve should open above 5.07 kPa (38 mmHg, 1.5 in.Hg).
If the pressure hold below 5.07 kPa (38 mmHg, 1.5 in.Hg), the valve is OK.
If the pressure doesn't hold,
replace the EVAP two way valve.