This replacement fuel filter element fits inside the carburetor on 3.0L, 4.3L, 5.0L and 5.7L MerCruiser engines. Don’t let water moisture or other fuel contaminants rob horsepower from your engine. Filter those particles before they can get to your engine. Refer to your owner’s manual for installation instructions and replacement schedule. This part is also called the fuel “strainer” on parts schematics.