Originally Posted by buttercr125
You hook the nitrogen tank to the smoke machine to pressurize the system and look for the smoke. You are not supposed to introduce oxygenated air into the EVAP system. Most if not all EVAP smoke machines are either pressurized with nitrogen or have a way to hook a nitrogen tank to them.
WE have been using a Smoke Pro for over 5 years and no issues w/regulated shop air. My opinion is nitrogen is an ultra safe option. A Smoke Pro is only a couple hundred bucks.