will keeping full gas tank keep evap codes off?how empty does tank have too be before evap start too pressure tank?

 

hey there,had the same problem,found out one of the vacum hoses from the gas tank to the vac can was disconnected ,hope this thread helps.

 

ty builder125 already look at hoses .all conected.as soon sun comes up im gona look at vent solenoid to clean it.if that not the prob on to the purge solenoid.just wondering if it takes less vacuum with full tank and more vacuum with empty tank.all ready did gas cap. .