Open the plastic cover of the EVAP service port, then use the spool wrench to remove the check valve clockwise, then install the EVAP service port adapter, and introduce smoke from the port into the EVAP leak detection system.
Automotive Smoke Machine Leak Detector - 12V Vacuum Smoke Machine Leak Tester
VEVOR Automotive Smoke Machine Leak Detector EVAP Fuel Smoke Machine Leak Tester
Automotive Smoke Machine Leak Detector EVAP Fuel Smoke Machine Leak Tester