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I get the P0455 major leak combined with P0450 Tank pressure. Watching my driving habits, I reset the code - and it comes on reliably after about 30 minutes of driving while taking off from a stop. Seems to be coordinated with letting the clutch out - could it be because the pressure is dropping to the vent valve with the RPMs? Is there a recommended way to check the function of the vent valve before I replace it? Thank you for your expertise.
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