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WALBRO 22-016 In-Tank Fuel Pump Filter ymm_21 0 Diesel 262 / 193The fuel pump pre filter or fuel sock, is a fuel system's first line of protection against fuel system contamination; including dirt, dust, or other fine particles found in petrol. Petrol also has a tendency to varnish over time, leaving a thick filmy layer over everything inside the tank from the fuel pump internals, to the tank walls, and especially pre filter. A varnished or clogged strainer restricts flow, forcing the fuel pump to work harder,