K&N Filter Fuel Filters

K&N’s fuel filters cover sealed replacement filters and universal in-line filters, and a small group of fuel pumps is listed with them. The PF series are sealed filters with a steel housing and cellulose and glass media, numbered from PF-1000 to PF-5100, some in cartridge form. Each replaces a particular original filter, so the part number is the way to find the right one.

The 81 series are universal in-line filters with an element of sintered porous bronze or stainless steel mesh, and 81-0300 and 81-0301 are listed as replacement filters. Coarser mesh and bronze elements are generally used before a fuel pump or on a carburettor feed, and finer media after the pump on injection systems.

The fuel pumps, 81-0400 to 81-0402 and the diesel 81-0403, are 12-volt in-line pumps that K&N supplies with a filter and fitting hardware.

These filters carry no vehicle fitment, so work from the part number of the filter you are replacing, or from the inlet and outlet sizes. Check the flow direction marked on the housing, and depressurise a fuel-injected system before opening any line.