P0452 Error Code - Toyota Yaris Forums

dogsridewith · 12-31-2018, 02:12 PM

A lot of bad/wrong explanations in that thread, but some good. I never heard of the rollover valve and am really glad to know now!
My own feeling at this point is that problems with the roll over valve or the vent pipe along the filler pipe are what can cause "slow fill." That tank fill-ups don't vent through the EVAP system. And overfilling will hurt the EVAP system. And having to dribble-fill a "slow tank" leads people to overfilling.

12-31-2018, 02:12 PM	#13
dogsridewith Drives: 2007 2-door hatchback Join Date: Jul 2016 Location: USAnotCA Posts: 750	Toyota Yaris fuel filler pipe rollover valve EVAP charcoal canister slow over fill A lot of bad/wrong explanations in that thread, but some good. I never heard of the rollover valve and am really glad to know now! My own feeling at this point is that problems with the roll over valve or the vent pipe along the filler pipe are what can cause "slow fill." That tank fill-ups don't vent through the EVAP system. And overfilling will hurt the EVAP system. And having to dribble-fill a "slow tank" leads people to overfilling.