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EVAP Canister Diagnosis

Disconnect vacuum hoses from EVAP canister. Blow air into tank port. Air should escape from purge pipe and vacuum port. See Fig 1. If EVAP canister does not operate as described, replace EVAP canister.

Fig 1: Identifying EVAP Canister Pipes & Ports
G00011497Courtesy of GENERAL MOTORS CORP.
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