525efi fuel filters
 

Have had good luck with Leaders RPM, just buy 3 and get free ship
https://leadersrpmshop.com/mercury-m...el-35-807174t/

Nice price at that Leaders link.
Otherwise, On the aftermarket I did just that.
Got my boat, thought go through and do all the fluids and filters, seen the price of those POS compared to a comparable GM fuel filter. Thought that's F'in stupid!
Thought that even more when I cut one open and there was a measly plastic strainer tube in there.
Can't find any pics I took.
Seems they are more of a prepump strainer.

My boat had NPT barbs into those OEM strainers anyhow, with hoses and worm clamps.
Discussed it at this link on here a while ago and linked what I replaced mine with.
496HO Down on power - Page 6 - Offshoreonly.com

I've ordered them from two different places now that had them listed as in stock only to receive an email stating they are backordered. Leaders was the second place. I looked on Summit and there's hundreds of inline filters with replaceable filter elements. It's hard to see which ones would have the right fitting. My filter uses flared ends almost like brake lines.

I just bought the ebay one posted above. Sure hope it's not a knock off. The knock offs I bought on Amazon looked identical but they were NPT threads..

Yeah, I don't have 525, so I forgot they are different. Mine are the NPT.

The correct ones should be inverted flare fittings both ends ?

fuel filter
 

common filter, that with basic research & cross reference, can be found all over the place on the internet for ten bucks each shipped. its a gm/ac-delco filter.

and the # is ? :)

I’ve done searching and only found people that have tried and not cone up with anything that worked right.