there might be a leak anywhere in the evap system.
see if it builds pressure in the tank after some time. if not you should inspect the line that comes from the tank and goes to the evap canister. after it goes to the canister, it goes thru a solenoid to the throttle body. the evap line is usually made of metal and comes out somewhere around the firewall. inspect all lines. the canister is behind the bumper on the pass. side. the solenoid is behind the fuel rail
you need to take a pic of where it rubs
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