The first priority at FASS is to guarantee that only the purest quality fuel is delivered to your diesel engine. Fass Fuel achieves this by removing dirt, water and air through our two step filtration process while switching the fuel delivery process from a suction delivery to a pressure delivery, thus eliminating the possibility of reintroducing air back into the fuel after it has already been removed. With filtration being such an important process, Fass Fuel Systems chooses to use fuel filters that have a rating as low as 3 Micron, which provides superior protection from debris in your diesel fuel.