Define “never.”
Never used means it’s clean.
If never doesn’t really mean “never”, does it smell like gas. Does it pump any gas out? Does the pump work? Have you tried?
I wouldn’t even consider dropping the tank unless it was deemed necessary which is highly unlikely.
You need to be more specific as to the issue with it. Rvnetters are pretending it’s a 60 year old tank in a Studebaker!
If pump works IE makes noise, dump in 5 gal and pump it back out after sloshing around and see what comes out.
If you have a generator it has a inline filter. Keep a spare in case it plugs up.