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Vapor Canister

  1. Install a short length of hose to lower port of purge valve. Blow into hose. Little or no air should pass into canister (a small amount of air will pass if the canister has a constant purge hole).
  2. Using a hand-held vacuum pump, apply 15 in. Hg to vacuum control (upper) port. Vacuum should hold for 20 seconds. If not, replace canister.
  3. With vacuum still applied, again try to blow through hose connected lower port. An increased flow of air should be observed. If not, replace canister.
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