Fuel Stabilizer, Marine, 8 fluid oz., Treats 16 Gallons of Fuel, Each Stored fuel can deteriorate in 60 days, causing gum and varnish buildup in the fuel system, hard starting, and poor performance. Mallory Marine fuel stabilizer keeps fuel fresh for easier starts, less maintenance, and improved performance. It also helps prevent your carburetor and fuel system from varnishing during storage or extended out-of-use periods and keeps fuel fresh for up to one year.