Sierra 18-7977-1 Mercruiser Fuel Filter Supersedes 18-7977 Sierra replacement fuel filters are manufactured to meet or exceed OEM requirements. It is recommended to change this filter and your 18-7715 Pre Fuel Filter at the same time for optimal engine performance. Fits 2004 Newer MCMMIE engine with Gen III fuel cooler Micron Rating 20 Interchangeable with Mallory 9-37827 Mercruiser Stern Drive 35-866171A01 35-8M0093688 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.