Fuel Set 500ml - Treats 2000 litres. - Blocked filters, stuck injectors and even engine failure can be caused by a microscopic fungus, that is present to varying extents in all fuel oil. Fuel Set Liquid is a complete fuel conditioner, which will reduce running and maintenance costs, and it absorbs any water present in the fuel, so you don't experience rough spots or misfiring. Treats diesel, petrol and 2 stroke fuel, and is completely harmless and environmentally friendly. It dilutes with fuel at a very economical 4000:1 ratio. Treats 2000 Litres.