Mercury - Quickare Fuel Treatment Additive Fuel System Care Liquid Formula 8M0047920. Overview. Every boater has had that moment when the engine fires up smoother than expected-the kind of start that tells you everything in your fuel system is clean, balanced, and ready for the day ahead. That sense of ease doesn't come by accident. It comes from taking care of the parts of your engine you rarely see but always rely on. With Mercury Quickare Fuel Treatment, you'll feel that quiet confidence ever