Where is the Canister purge valve located on a 1999 Cadillac Catera on 1999 Cadillac Catera

When I fill up with gas the nozzle keeps shutting off. I have been doing a lot of reading iand it appears that it is the Canister Purge valve, but I don't know where it is. Is this something that I have to get a mechanic to change.

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