Fuel System Treatment - A fuel system treatment that conditions and protects against corrosion, cleans injectors and carburettors, prevents deposit build-up and assists easy starting after winter storage. Can be added direct to the fuel tank at 1% to 2% using the following ratios: For 1% mix 100 parts fuel to 1 part Fuel System Treatment. For 2% mix 50 parts fuel to 1 part Fuel System Treatment. Will treat up to 25 litres of fuel.