Mercury - Composite Carburetor Float Fuel System Marine Composite 8673. Overview. If you have ever dealt with a carbureted outboard that refuses to idle right or keeps flooding when you least expect it, you know how something as small as a float can change your whole day on the water. The Quicksilver 8673 Composite Float brings back that easy, predictable performance that older Mercury two-strokes are known for. There's something reassuring about installing a part that feels purpose-built - ligh