Dual media primary/secondary fuel filter

Details Dual media primary/secondary fuel filter Dual media primary/secondary fuel filter

B - Operations, Transporting

01

D

B01D 27/14 (2006.01) B01D 27/08 (2006.01)

Patent

CA 2225775

A dual media fuel filter which combines the functions of filtering the fuel passing from a fuel source to a lift pump, and the function of filtering the fuel passing from the lift pump to the fuel injectors. The present invention provides a fuel pump with distinct primary and secondary fuel filter cartridges which are compression loaded into a self-contained oil filter canister adapted for threaded attachment to an engine block. The primary filter cartridge is provided to filter fuel drawn under suction from a fuel source into a lift pump, and is therefore provided with a relatively coarse filtering medium to allow for adequate fuel to pass therethrough even under negative pressure and cold temperature conditions. The secondary filter cartridge is provided with a relatively fine filtering medium to filter the fuel passing from the lift pump and into the fuel injectors.

Filtre à essence à deux éléments qui combine la fonction de filtrage de l'essence passant d'une source d'essence à une pompe aspirante et la fonction de filtrage de l'essence passant de la pompe aspirante aux injecteurs. La présente invention décrit une pompe à essence avec cartouches filtrantes primaire et secondaire distinctes qui sont chargées à compression dans une boîte métallique de filtre à l'huile autonome adaptée pour fixation filetée à un bloc moteur. La cartouche filtrante primaire sert à filtrer l'essence tirée par aspiration d'une source d'essence dans une pompe aspirante, et elle est par conséquent munie d'un élément filtrant relativement grossier pour permettre le passage d'un volume suffisant d'essence, même par temps froid et sous pression négative. La cartouche filtrante secondaire est munie d'un élément filtrant relativement fin pour filtrer l'essence passant de la pompe aspirante aux injecteurs.

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