wow! I'm a newbe to this..That is,,,to this sight and big boats!!We just went from a smaller boat to a bigger boat... We just got a 2003 Formula Fastec, it has twin 525 EFI's in it ...I guess we have one more thing to keep an eye on!..Found fuel in the lube for the seawater/fuel pump on both engines also!!!... Anyone know if merc has come up with a new fix or new base yet..From what I've been reading and researching,,, its the base thats leaking?? Anyone know the cost on rebuilding?

That setup is the biggest POS next to a damn Yugo to come down the pike in years...yes they love to fail, if you are getting fuel in the oil replace the fuel pump now, ck the bearings and keep a eye on the fluid...when they take out the bearing from the oil being contaminated from fuel it ain't cheap !

Any rule of thumb for swapping out the fuel pump prior to it starting to leak down? Change it out every two-years? Rather be proactive in saving the bearings as I know how much those things are!!! And how much a day on the water means to me!!

Engineering Marvel!!!

The diaphram on the fuel pump wears out and starts leaking into the oil . They all do this

have a 02 575sci and had the same problem. Replace the pumps last year and have about 50 hrs on them now and checked the oil and no sign of fuel. If theres fuel in the oil there bad, dont just change the oil change the pumps....

Ditto.

You could also tap the bottom and install a drain plug. I think some pumps actually had removable plugs on the bottom.

Is there a rebuild kit for the diaphragm or is there a aftermarket fuel pump? I'm guessing being its a Mercury Racing part you have to buy OEM. I'm addressing changing the lube on mine this year, but if they are leaking I might as well rebuild/replace the pumps while I'm at it.

What weight oil are you guys putting back in? I'm running 75W110 in my drives I'm guessing thats too heavy for this pump.

I'm also going to attempt to put a drain plug in mine while they are out. How did using the drain plug with a magnet on it work out?

I had to rebuild sea pump last year because the diluted oil took out the bearings and seized the pump up bad enough it brike the shaft. Anyways, I got my pump from Speed and Custom Marine (speedcustommarine.com). It was $95.00 plus the ride and it is the same oem pump other than it is not painted black.

http://www.offshoreonly.com/forums/g...fuel-pump.html going thru this right now,,,had a drain plug put in bottom for ez service,,new fuel pump also,,,cv marine fuel pumps makes a replacement fuel pump,,,not cheap tho http://www.cvproducts.com/Products.aspx?Search=fuel pump&CATID=10000441

Irish,,,i was wondering the same,,,this is what i found ,,hope it helps,,,http://www.offshoreonly.com/forums/g...el-pump-2.html