How to detect EVAP system leak with smoke tester?

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

JACOBANDNICKOLAS

MECHANIC
109,694 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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