Fuel Filter: Description and Operation

Fuel Filter:

IN-LINE FUEL FILTER

DESCRIPTION


A molded nylon in-line fuel filter is used in the fuel feed line ahead of the fuel injection system. The nylon filter housing is constructed to withstand maximum fuel system pressure, exposure to fuel additives, and changes in temperature. The fifteen micron filter element is made of paper, and is designed to trap particles in the fuel that may damage the injection system. Quick connect type fittings are used at both ends of the filter. Special care should be taken when working on a vehicle with a nylon filter:

WARNING: To reduce the risk of fire and personal injury:
^ Always cover a nylon filter with a wet towel before using a torch near it. Also, never expose the vehicle to temperatures higher than 115°C (239°F) for more than one hour, or more than 90°C (194°F) for any extended period.
^ Take care not to nick or scratch the fuel filter. If damaged, it must be replaced.

FUEL PUMP FILTER (STRAINER/SOCK)

A woven plastic fuel pump filter (strainer/sock) is attached to the lower end of the fuel pump in the fuel tank. The functions of the fuel pump filter are to filter contaminates and to wick fuel.
The life of the fuel pump filter is generally considered to be the life of the fuel pump. The fuel pump filter is self-cleaning and normally requires no maintenance. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment or water. In which case the fuel tank should be cleaned. If the fuel pump filter is plugged, replace it with a new one.