bears,
First, I loosen the secondary filter lid on the engine.
Then, I remove the water drain from the lower front of the HFCM. This will be a 6mm hex. About the only allen wrench that will fit is the classic L shaped allen wrench, use the short side and try to stay out of the fuel stream.
To remove the lid and filter, the easiest way I have found is with a 36mm socket and ratchet. But, you can only move the ratchet 1 click at a time. You will get a bit a fuel from the housing, but not at bad if you drain it first.
The filter is normally snapped into the lid (Just like the oil filter). I have not been able to get the out together. I have to pop them apart, remove the filter from where it is trapped in the frame by...... everything, then remove the lid..... you will see what I mean when you are there.
Then, replace the O-ring on the lid. Feed the lid and filter back into its spot, snap the two together and reinsert into the HFCM. Thread it in, and tighten..... but remember that is a plastic/composite housing, so don't break it....
Remove the secondary, change filter and o-ring and put it back together. The secondary has a 1/2 square molded into the cap for a ratchet and/or extension. The primary does not.
Don't forget to close and tighten the drain plug. Cycle the key to the on position 3 or 4 times. Then start it up......