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Q: EVAP system on 2001 Chevrolet Blazer

I have a P0440 code.Evap System no flow during purge.
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Basically, this code indicates a large leak or large restriction that is preventing the EVAP system from developing / holding vacuum.

Test to ensure your gas cap is secure. Other than that, a further diagnostic test must be performed using proper test equipment, including a smoke vapor machine. Anything other than that will be guess work.

Good luck,
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