It's an easy affair... once you know what NOT to do.

I hate to admit this, but when I first did mine, I made the incorrect assumption that you remove it just like a spin-on oil filter.. after all it looks like one... right ?

So after replacing my pre-filter, I reach into my tool chest and pull out my trusty adjustable oil filter wrench and crank away.. it doesn't budge and I ended up crushing the filter housing. About that time is when I noticed the large "bolt head" on top of the filter housing.. oh crap ! !

Basically the filter acts like a nut on bolt. Loosen that "bolt" on the top of the filter housing (it extends through the filter housing and screws into the filter) and the filter will loosen up where you can spin it off. Use a small can under the filter to catch the fuel and filter.

There maybe some copper seal rings/washers involved too, so be careful when you pull the filter out... I just don't remember.

When you put the new filter on, you'll probably need to use the priming pump to pull fuel into it and eliminate the air.

Hope this helps !