WIX 33958 Heavy Duty Diesel Fuel Filter Assembly

The WIX 33958 Heavy Duty Diesel Fuel Filter Assembly provides dependable filtration for heavy-duty diesel fuel systems, protecting injectors, fuel pumps, and engine components from dirt, rust, and fuel impurities. This spin-on filter uses cellulose filtration media with a nominal 19 micron rating and a Beta ratio of 2/20 = 6/30, supporting reliable contaminant removal in demanding environments. It measures 8.957 inches tall (227.5 mm) with an outer diameter of 4.658 inches (118 mm), features a 1 1/4-12 thread, and withstands a burst pressure of 370 psi, enabling up to 180 GPH of flow. Installation is spin-on mounting, and the unit is designed specifically for heavy-duty diesel fuel filtration. Common applications include commercial fleet trucks, industrial power units, construction machinery, and mining equipment, where clean fuel delivery helps maintain injector efficiency, reduce fuel-system wear, and extend engine service life. Cross references include NAPA Gold 3958, with OEM equivalents AC Delco TP958F, Fleetguard FF5036, and Donaldson P550958; common replacements are Baldwin BF784, Fleetguard FF5036, and Donaldson P550958. It is used for preventive maintenance and fuel system servicing, including replacement of contaminated or restricted diesel fuel filters.