Tools list for impeller change on 525 EFI
 

Going to change them tomorrow, first time and don't want to forget anything.

Any help is appreciated.

Sockets, open end wrenches, grease (for squeezing impeller into housing), nut driver (for hose clamps)

can't really think of anything else..

Beer!!!!

I'm not familiar with your set-up but when I did mine, I needed a pry bar to apply tension to the belt. Also used a permanent marker to mark the housing, end caps and mounting bracket. I didn't mark the first one and spent an extra 20 mins trying to figure out how or orient the pieces so everything lined up right. The second one went real quick.
A cordless drill with a 5/16' nut-driver bit comes in real handy for the hose clamps if you have room to get it down there.
May need a large flat blade screwdriver to help pry off the hoses if they are stuck on the nipples.

I did mine while the engs were out. Not looking fwd to doing them with the engs installed.

Wrench for fuel line. 3/4 inch if I remember right. An assortment of 1/2 inch wrenches and a curved one if you have one. Something to plug the rubber fuel hose. Don't forget to put fresh oil in the fuel pump housing. Use gear lube. It's really not hard to pull the assembly off if you are able to get in there and lay next to the engine.I discovered a nifty way to install the impeller. I put a hose clamp on it and tighten it with the rubber vanes bent in the proper direction. I use dish soap or anti-freeze for lube. Find a tool that will fit the center of the impeller and let you turn it as you install it. Take the hose clamp off as it goes into place.

Socket set.
Zip Ties.
Dish Soap.

Thanks guys. Did them both yesterday, pretty simple job. Would help with a cordless 1/4 ratchet. I bought one this morning for next time.

I'm about to do this myself as well. Do you have to remove the pump assembly from the engine entirely or is it possible to just remove the plastic housing, replace the impeller and put it back on...

Here is what I did:

- removed the fuel feed
- removed the steel bypass fuel line
- removed the vent hose
- removed the serp belt
- removed both intake and discharge hoses off the back of the impeller housing
- removed the 3 bolts that hold the entire assy to the bracket

I then on my dock box took it apart and changed the housing, impeller and drained the fuel/gear lube and replaced it.

I never did it before and it took me just under 3 hours to do both sides.

Thanks pwraddr. That is helpful.. I would still like to know if it can be done without removing the pump from the engine ?? ie: just unbolt the plastic housing, replace the impeller and rebolt the plastic housing.