[Richard]

Nope, that's good. I didn't know if you had the Racor filter or something else.

You might try heating the threaded piece with a hair dryer to help loosen it up. Sometimes heat or a couple of heat cycles can break threaded connection loose.

I know that it takes a LOT of force to break mine loose. Heavy duty strap wrench and careful attention to where your hands will land when it gives are the order of the day.

On mine, the wrench will not work because the filter assembly is mounted hard up against the bulkhead. Only a strap wrench will work (demonstrated recently at Speedco, they were impressed when I had to take it loose for them).