Fuel Fit® from Briggs and Stratton is a remedial additive for ethanol-blend fuels to protect engines against the corrosive effects of ethanol.
Modern E10 unleaded petrol has a higher ethanol content, which brings the benefit of lowering emissions from petrol machines and vehicles. However, it can cause problems if the fuel is left to stand for more than a few weeks.
The ethanol in the fuel bonds with moisture in the atmosphere and can form a layer of water inside the tank. This water then has a corrosive effect on the engine, causing silent damage.
Adding Fuel Fit to the fuel before it goes into the engine protects against corrosion, prevents contaminant build-up and wards off chemical reactions caused by dissolved metals.