wellcrafted

Same problem on my 2008 600 sci, it happens with all mercs, I drilled a hole in my and tapped it. Now every 10 hours pull out the tap and drain it and put fresh oil in, every time i drain it has gas in there . This saves having to by the cheap a$$ pumps that are made in india for 2 bucks and marked up .

JRider

iTrader: (1)

I thought they already had plugs in them?

TWIN-SPINS

he,s talking about another plug to drain the oil,,that one you have to do yourself

JRider

iTrader: (1)

So it has a fill plug and no drain? great design.

c_deezy

iTrader: (1)

Correct. So you have to remove it and turn it on the side to drain, or if you leave it in place you need to use a little siphon pump to try to suck it out.

I keep meaning to drill and tap a drain plug on mine, but always in such a hurry to get it removed and re-installed I never do.

SME1

I saw this pump in another post. Can someone confirm this will work on the 525efi?

http://http://www.autozone.com/autozone/catalog/parts/partsProduct.jsp?itemIdentifier=77698_0_0_&skuDesc ription=Airtex+Master+/+Fuel+Pump&brandName=Airtex+Master&displayName=Fue l+Pump&categoryNValue=14999999&sortType=&store=243 9&isSearchByPartNumber=true&fromWhere=&fromString= search&counter=0&itemId=78-0&navValue=14900078&filterByKeyWord=60932&productI d=77698&searchText=60932&categoryDisplayName=Fuel+ Delivery&parentId=49-0

teamsynergy

I dont think it will. If you run the part number for the fuel pump used on the 525efi... you will see that it is used on only a handful of engines... mostly EFI and SC based systems. Not sure if its the GPM or PSI but...

Nordicflame

iTrader: (4)

If you desire to replace the mech pump simply use a Holley 12-454-11 (or more if you need) by re-using the main body of the existing pump (with armature), remove the 6-8 screws and mount the new diaphram assembly and outer housing with the Holley unit.
Works pefect...
Dave

EdNewman

I am pretty sure the airtex is the oem, but once you add shipping, costs pretty close to the same and you need to epoxy paint it so I just bought Merc ones to replace both my pumps this spring. One was a mess, the other not bad. Definitely a 100 hour max replacement cycle on these.

502 Magnum

We got the 502 Mag Mpi year 1998-2000 without this stupid water/gass pump combo,
is this only electric presure pump enough for this motor?I`m afraid not, why cant Merc put a proper el pump on the blue motors and eliminate this old mechanical car gas pump in a bad combination with sea water pump?What happens if I skip the mech pump on my 525 and 500 EFI motors?Are they starving and burning up?Thanks
Bjorn.