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Curious what plastic ring around outside of gas filler tube Is for? P/N 77219
There is a hose going from it to the purge solenoid.
when system is pressurize, air is escaping through this plastic ring. Not through gas cap.
Seems my issue is pointing to a bad vapor canister.
 

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Toyota uses 10 digit part numbers so what you quoted is only half a number. That being said it could be some other hose that has a leak. I just read a thread on here the other day where a guy did an evap test using a tech stream. It fully pressurizes the system and helps to identify leaks. Cant say I can find it now but point is many of the failures seem to be leaks, not the cannister itself. And thats also the most expensive part so keep check for leaks and go for the low hanging fruit first.
 
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