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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
Canister Filter = storage of venting gas fumes from the gas tank.
Canister Purge Solenoid = allow purging of fumes at specific moments, controlled by the EFI computer..... otherwise, a permanent vacuum leak would be present.
The gas tank needs to breath...... whether you let it breath directly to the atmosphere (gas fumes = gas odor) or keep the canister functional (no fuel smell around the car)..... is your call...