I see at least four different spin on fuel filter/water sep: 18-7944, 18-7844, 18-7845, 18-7945,18-7945C is chrome- lol
Which would be the best to replace the factory Mercury one on a 1990's V6 i/o Mercruiser?
seems the 7944 and 7945 are 10 micron, others are 21 micron. I suspect a long 21...