nsxd11157a.pdf

Evaporative Emission (EVAP) Two Way Valve Testing
1. Remove the fuel fill cap.
2. Remove vapor line from the fuel tank and connect
to T-fitting from vacuum gauge and vacuum pump
as shown.
PRESSURE SIDE
3. Apply vacuum slowly and continuously while wat-
ching the gauge.
Vacuum should stabilize momentarily at 5 to 15
mmHg (0.2 to 0.6 in.Hg).
5. Slowly pressurize the vapor line while watching the
gauge.
Pressure should stabilize at 10 to 35 mmHg (0.4 to
1.4 in. Hg).
VACUUM/PRESSURE GAUGE
0-4 in. Hg
07JAZ–001000A
VACUUM PUMP/
GAUGE
A973X–041–XXXXX
T-FITTING
If vacuum stabilizes (valve opens) below 5
mmHg (0.2 in. Hg) or above 15 mmHg (0.6 in.
Hg), install new valve and retest.
4. Move vacuum pump hose from vacuum to pressure
fitting, and move vacuum gauge hose from vacuum
to pressure side as shown.
If pressure momentarily stabilizes (valve opens)
at 10 to 35 mmHg (0.4 to 1.4 in. Hg), the valve
is OK.
If pressure stabilizes below 10 mmHg (0.4 in.
Hg) or above 35 mmHg (1.4 in. Hg), install a
new valve and retest.