2002 Jeep 4.0 165,000 miles EVAP issue. About 6 months ago engine light came on. Hooked my scanner and it showed code P0455 perminet code large evap leak and pending code small evap leak P0442. To brutal of a winter so working on it now. Changed the gas cap cheap and easy. Erased codes but came back in 2 weeks. So there is a green cap that says evap test port. Is this used for smoke machine??. Can I put low air pressure say 10 psi through it or will it damage something. Inspection coming up end of month. Thanks guys
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