How To Check Evap System Without Smoke Machine

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Best guess is to somehow pressurize the system with air from the filler neck. Spray all the lines with soapy water. Im sure duct tape would be enough to keep. Unpowered, the purge valve.

Turn the selector on the smoke machine to smoke or visible vapor. How do you detect an evap leak? Smoke test the idea behind the smoke test is simple, blow smoke into the evap system and look for smoke escaping from a compromised valve, seal,. Smoke tests just send smoke into the evap system to see if it escapes through a valve, a seal, a hose, or a tube. This is the best accurate method to manually test your vehicle. Really, the name says it all — a smoke machine creates, you guessed it, smoke. It then pumps that smoke into the evap system at a low pressure to avoid causing any damage. During evap testing, a loose or missing gas cap will be detected as a leak, a diagnostic trouble code will be stored, and the mil will illuminate. A loose gas cap might result.