Evaporative Emissions System: Testing and Inspection

EVAP Control System 1.6 Storm:

CANISTER AND PURGE VALVE TESTING

1. Connect a length of hose to the lower purge valve tube and blow through it. Little or no air should pass into the canister. A small amount of air will pass if the canister has a constant purge orifice.
2. With a hand vacuum pump, apply vacuum of 375 mmHg (15 in.Hg) through the upper control valve tube.
3. If the diaphragm holds vacuum, again blow through the hose connected to the lower tube. An increased flow of air should be observed.
4. If air flow is not increased, replace the canister and purge valve assembly.

CANISTER VISUAL CHECK

1. Replace canister if cracked or otherwise damaged.
2. Replace canister if fuel is leaking from the bottom.
3. If dirty, plugged or damaged, replace filter at bottom of canister.