where is purge valve pulses ?
On the EVAP charcoal canister..but before you do that buy a gas cap. Click image ..and Mr/Ms reviewer I KNOW this is a public domain image please don't delete it
It's called 'purge valve'. When the charcoal soaks up fumes from refueling , the valve opens to purge the vapors form the charcoal, sucking it back in to intake vacuum. The 'pulses' are the valve not functioning properly. but remember, before you do this buy a gas cap..or at least check it.
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