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.

It looks like it can be done, however tough to replace the small seal and then line up the wear plate and bolt holes and impeller.

Easier to pull the pump. You will want to change the fuel pump lube too because gas always gets in there.

It can be done, and I imagine on your center and/or engine(s), you do not have much clearance to pull things off the motor forward. You really do want to remove the whole pump. You would be forced to bend two very stiff hoses (intake & discharge) to remove them from the back of the pump housing, and they are on plastic barbs. You will likely crack one or both of the plastic barbs while trying to attempt this. It's in your best interest to pull the whole pump/pulley assembly forward to remove it.

Got to it, this afternoon. Removing the hoses was a piece of cake. I wound up leaving the pump on the engine but I did loosen the tension on the serpentine belt and that gave me enough wiggle room to disassemble and reassemble everything without a problem. Tested out on the water today and all good.. Very easy to do..

The lube reservoir is most likely full of gasoline. Changing the oil is part of the job.

Very true, both mine were full.

Also, if you take all 5 bolts out to change the impeller, the pump is off the bracket / motor. Unsure then how it was done with removing.

Pump was left dangling but held in place by the belt. I just loosened the belt to re-assemble. I took the fill screw off the lube reservoir and there was oil in there, not gas, so I left alone. My pumps were all redone at the beginning of the season. My starboard water pressure gauge has been jumping around a lot and I also noticed some inconsistent water flow out of the exhaust. Thought it might be a bad impeller. Engine temps have been fine but changed the impeller just in case..

I think I'm going to do the other pumps now.. But this time, I will heed your advice and remove the pumps entirely so I can change the lube. What do you guys use to plug the fuel lines?

Mine is rubber and I stick a tapered punch in it.

guys I have easy access to the back of my pump to change the impeller, is there any reason I should still remove the entire pump to do it?

Not as long as you have no issue removing the intake and discharge hoses. IME, these are very stiff hoses and don't like to bend much. Your mileage may vary.

It can be done but after doing it once leaving the pump on the engine, I would never do it again that way. You have to remove all of the bolts to get to the impeller and once you do that, the pump is floating free anyway. Unless you loosen the belt, you will have a hell of time getting the housing and bolts to line up. Once you loosen the belt, you might as well take the pump off. And as others have said, you will want to change the gear lube in the fuel pump. I didn't realize how easy it really is which is why I was also reluctant to remove the pump. Ironically, two days after I changed the pump, we ran shallow, sucked in sand and completely fried the brand new impeller I had installed. I just changed three sea water pumps last week!!