Smoke Test Evap System

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A quick internet search will tell you to check your fuel cap and fuel tank purge valve. I replaced my fuel cap and removed/inspected my purge valve. Valve has a tight seal when. Testing them at pressures above 7 psi could blow.

What is the purpose of the vent valve. During testing the vent solenoid is closed, and purging takes place in the evap system. The vacuum is monitored by a fuel tank. 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. Joined mar 25, 2007. Discussion starter · #1 · nov 26, 2011. I brought the durango in today to finally get a smoke test done on the evap system (code p0442) as i'd. Due to the evap system's vapors being.