Gasoline delivery-filtration systems presently used in vehicles are highly effective. Nevertheless, there is a continual evolution of the system as vehicles with improved emission profiles and fuel economy are manufactured and alternate automotive combustion fuels are being adopted. Therefore, an investigation of the fundamental parameters controlling delivery of filtered fuel to the engine is important to the engineers responsible for new designs. In this paper the basic engineering factors required to understand how in-tank fuel strainers function are discussed. Guidance in choosing fabrics that ensure optimum performance for various types of liquid fuels is also provided.