What a pain to get to the filter on this thing! I'll start by having the 2 wiring connectors and fuel line un hooked already. I'll let you figure out. It's easy enough. Spin the lock ring, it's easier with the proper tool but a flat screwdriver and hammer works if you're careful. Attachment 9625 There is no visible filter on the pump. Attachment 9626 Attachment 9627
To get to it, first unplug the 2 connectors at the top of the unit, un clip the small white half cylinder piece at the bottom with the tiny black tube/hose attached to it and slide the hose out of it's holder next to the sending unit.
Then....there is a tiny c-clip that has to come off the bottom of the spring loaded rod. Attachment 9628 after that the large white plastic cylinder parts separate after prying 3 little clips.
It shoud now come apart. Attachment 9629 the filter/strainer/sock can now be removed from the bottom of the pump. It just pull off. Attachment 9630 NOTE: You don't need to take it apart as far as I did in the last pic. The sock just pulls off and there is no need to pull the pump retainer clip or rubber isolator off. I did just cause I couldn't tell how it came apart.
Now whether Mitsu carries these filters is unknown to me, I'm sure there is something that should work though. I'm not going to be changing this filter on any cars unless I see someone tossing hand fulls of dirt in the tank though or drives around for a week with no fuel cap and the fuel door open...