Just a flat head or a Phillips screwdriver (or both), depending on what kind of clamps are on the hoses, plus a 22mm wrench for the nut on top of the secondary filter (as someone else already noted).

I also like to use a clamp-off tool on the hoses so I don't spill too much fuel in the process. I got mine here...

http://**************.com/node/235

...but I'm sure they're available elsewhere, too.

Good luck!

-Mark