Sta-Bil Marine Tune-Up Fuel TreatmentMarine Tune-Up by Sta-Bil is a fuel treatment designed to clean carbs and injectors. The special formula is compatible with all gas marine engines and quickly resolves rough-running engines by dissolving varnish and gum build up. Perfect for small boats and PWC's that could use a tune-up throughout the season.Features: Treats 20 Gallons of fuel; Dissolves build up; Compatible with all gas marine engines; Excellent mid season tune-up; Instructions:Sta-Bil Marine Tune-Up is an easy to use fuel treatment that pours directly into the fuel tank. The treatment addresses issues caused by ethanol-blended fuel or old neglected fuel systems. One treatment is enough to help restore lost engine performance. Use 1oz Sta-Bil Marine Tune Up for every 2.5 gallons of fuel; Once you've measured the correct ratio pour directly into the gas tank; Next top off the gas tank with fresh fuel; To finish start the engine and let it run uninterrupted for 15 minutes;