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How to detect EVAP system leak with smoke tester?

Tiny
XJSHEN
  • MEMBER
  • 2003 PONTIAC MONTANA
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 85,000 MILES
There was a EVAP system leak test failed by by DTC's diagnosis. I got smoke tester. But I don’t know where to connect the smoke delivery tube tip.
Thanks for your instruction and helps!
Saturday, November 21st, 2020 AT 2:01 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

The EVAP service port is located in the EVAP purge pipe between the EVAP purge solenoid and the EVAP canister. The service port is identified by a green-colored cap

I attached two pics below. The first shows the canister which is near the fuel tank. The second shows the solenoid. If I recall, the service port is near the purge solenoid (number 11 in pic 2)

Let me know if this helps.

Joe.
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Saturday, November 21st, 2020 AT 7:55 PM

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