3. You can spend all the money in the world on a fuel pump, but if you don’t keep the fuel clean, your engine simply won’t run properly. Holley offers a number of matching billet HP fuel filters for your fuel system. They are serviceable, and feature the same great construction and tough finish of the other components. For our system, we utilized a 100-micron filter (PN 162-564) as well as a 40-micron filter (PN 162-555) to make sure the fuel going in the pump, as well as coming out of it, is as pristine as can be. The filters retail for a little over $70 each.