What is fuel polishing?

Fuel polishing is the process of removing contamination such as water and particles from fuel to ensure that it remains in line with fuel specifications. Ideally, fuel should have an ISO particle code of 18/16/13 and a dissolved water content no greater than 200 parts per million. There should be no free or emulsified water present.

Fuel polishing will ensure that the fuel is 'clean and dry' meaning free from water and dirt thereby reducing the possibility of engine or fuel system damage.