Abstract: A fluid filter is described, comprising a filter body defining a cavity for a filter element, a first end cap for fitting on one end of the filter body, having an integrated single piece anti drain back valve and seal, and a second end cap for fitting on an opposite end of the filter body, having an integrated two part relief valve and supports for the filter element, formed by a relief valve body and a relief valve disc.

Abstract: A fluid filter assembly for filtering a fluid includes a housing base portion having an axially extending tube, a housing cover that is connected to the housing base portion to define an interior space, a filter element, and an interface structure. The filter element is disposed within the interior space and in engagement with the axially extending tube, the filter element having a filter media, a bottom end cap, a top end cap, and a mounting member defined by the top end cap, the mounting member having an axial wall with a vent passage therethrough and a radial wall that encircles the axial wall. The interface structure is connected to the housing cover and engages the top end cap of the filter element.

Abstract: A liquid filter assembly is provided. The preferred assembly includes a serviceable filter cartridge having a primary filter section and a secondary or bypass filter section. The preferred assembly includes a bypass valve arrangement and a suction filter arrangement. A valve, to allow flow from an interior of the assembly to a reservoir if needed, is provided. Preferred serviceable filter cartridges are shown.

Abstract: A component (5) for filters (10) comprising a plate (50) provided with at least a through-opening (54) in a thickness thereof and a perimeter edge to which a seal (51) is fixed, which seal (51) is destined to be interposed between a beaker-shaped body (21) and a cover (22) of a casing (20) of a filter (10), and a flat filter wall (55) fixed to the plate (50) in such a way as to intercept the at least a through-opening (54) and a hollow shank (53) suitable for accommodating the end of a pipe (56) for removal of the water accumulated on the bottom of the beaker body (21).

Abstract: The invention concerns a filter element as well as a liquid filter wherein the filter element is axially insertable into the filter housing (10, 11). The filter element (21) effects after mounting the closure of a non-return device for the raw liquid to be filtered with at least one non-return diaphragm (27). The non-return diaphragm (27) is attached to a terminal disk (24) of the filter element (21) in such a way that it effects an axial and/or a radial sealing action of the raw side (32) relative to the clean side (33) in the filter housing (10, 11). On the filter housing (10, 11) a drainage opening (18) for liquid is provided that is closed off by an additional sealing surface (31, 49) of the non-return diaphragm (27) when the filter element (10, 11) is installed.

Abstract: A fluid filter includes a base plate, a canister, and filtering media contained in the canister for filtering fluid from an inlet port to an outlet port. Notches are formed into an outer periphery of the base plate. An annular bead of the canister side wall is partially formed into the notches to provide a torque locking mechanism between the base plate and the canister. The terminating lip portion of the canister is wrapped around the outer face of the base plate and formed into an annular trough to directly secure the base plate to the canister. The annular trough includes a diverging outer wall that provides a narrow contact interface between the terminating lip portion and the retention corner of the base plate to thereby reduce moment loads induced therebetween as a result of high fluid pressures in the filter.

Abstract: A filter candle for precoat filtration has an end piece for connecting the filter candle to a separating wall of a precoat candle filter, a candle wall which together with a precoated precoat layer forms the active filter layer, and a terminating piece for separating an interior candle space from an unfiltrate space. An immersion tube is arranged in the interior candle space and reaches from outside the end piece, through the separating wall and the end piece, into a lower end portion of the interior candle space. At least one opening is provided in the immersion tube within the lower end portion, and a gap is formed between the immersion tube and the end piece.

Abstract: A filter unit includes a body portion having a proximal end and a distal end. First and second engagement surfaces traverse at least part of the body portion. The first and second engagement surfaces include a first segment that extends substantially parallel with the longitudinal extent of the body portion. A second segment extends at an angle relative to the longitudinal extent of the body portion. A third segment extends at a different angle than the second segment. A laterally extending key member is disposed on the body portion between the first engagement surface and the second engagement surface. An engagement protrusion extends from the proximal end. The engagement protrusion has a first portion that includes a first radius of curvature and a second portion opposing the first portion that includes a second radius of curvature that is larger than the first radius of curvature.

Abstract: A water filter system includes a filter unit having a body portion adapted to be rotatingly received into a filter head assembly. An engagement protrusion extends from the body portion and is adapted for reception in a complementary receiver in the filter head assembly. An electronic device is disposed on the filter unit having a memory storage unit. A laterally extending key member is disposed on the body portion between the first engagement surface and the second engagement surface. The laterally extending key member is adapted to reposition an interference member from an interference position, whereby the body portion can be fully inserted into the filter head assembly to a non-interference position, whereby the body portion can be fully inserted into the filter head assembly.

Abstract: A water filtration system includes a faucet assembly and a filtration assembly. The filtration assembly includes a filter assembly; a filter bracket or mounting assembly for securing the filter assembly to a support surface or structure; and a filter manifold assembly including an unfiltered water inlet for connecting to an unfiltered water supply and a filtered water outlet for connecting to a valve assembly of the faucet assembly. The filter assembly interfaces with the filter manifold assembly to provide filtered water to the faucet assembly under control of the valve assembly. A filter that otherwise would not interface with the filter bracket/mounting assembly and/or the filter manifold assembly can be adapted to work in the water filtration system by using a filter adaptor assembly.

Abstract: A filter cartridge includes a housing, a lid, a filter element and a positioning cylinder. The lid is provided for covering an opening of the housing. The filter element is disposed in the housing. The positioning cylinder together with the filter element is disposed in the housing and defining a passageway for reception of the filter element. Further, the positioning cylinder includes a plurality of bulging portions disposed about the passageway and each protruding toward a centerline axis of the passageway. The bulging portions of the positioning cylinder have their highest points equally spaced apart from the centerline axis of the passageway.

Abstract: A portable table top filter assembly including a filter housing enveloping a filter having an inlet and an outlet for the fluid; a flat bottomed filter base having an inlet port and an outlet port communicating with the inlet and outlet of the filter housing and a protruding rim having connectors on an outside surface of the rim recessed from the main body of the filter base, an inlet entry port at a bottom section of the filter base for connecting to a fluid source and communicating with the inlet port of the filter base, an outlet exit port connecting to a fluid delivery device and communicating with the outlet port of the filter base; and, a filter locking ring locking the filter housing to the filter base when a connector at the filter locking ring connects with the connector at the filter base.

Abstract: A filter assembly comprises a filter housing (23) into which a filter element is insertable. A core element (38) is provided extending within the housing (23). The filter assembly comprises a coupling assembly (200) that is insertable into the housing (23), the coupling assembly (200) comprising a leaf spring (201) having a span larger than an internal diameter of the filter housing (23), such that when the leaf spring (201) is inserted into the filter housing (23) the outer edge of the leaf spring (201) engages an inner surface of the filter housing (23) and the leaf spring (201) bulges in the direction of insertion of the leaf spring into the housing, preventing removal of the leaf spring, in a direction opposite to the insertion direction, from the filter housing (23), the coupling assembly (200) comprising a connecting part for connecting the core element (38) to the coupling assembly (200).

Abstract: A filter device having a filter element (9) forming a body extending along a longitudinal axis received in a housing (1) closed by a cover part (3). A sealing arrangement (49) is provided to form a fluid-tight seal between the housing (1) and the cover part (3). The sealing arrangement (49) is a component of a filter element (9) and is fixed to a sealing carrier (48) rigidly connected to the filter element.

Abstract: A ring filter insert (3) which can be flowed through radially has, in at least one of its end disks (4, 5), at least one connecting channel (28) which runs radially between interior and exterior of this end disk (4; 5). With such a ring filter insert (3), through a liquid supply channel (14) which is conducted through the central inner space of the ring filter insert (3) which serves as the crude space or clean space, it is possible in construction and rational terms to pass liquid through the at least one connecting channel (28) in at least one of the two end disks (4, 5) of the ring filter insert (3) from the radial inside outward into one of the two crude spaces or clean spaces which are sealed from the other crude space or clean space and communicate only through the filter medium of the ring filter insert (3). The flow through the at least one connecting channel (28) in at least one of the two end disks (4, 5) may also be in the reverse direction from the radial outside inward.

Abstract: An endcap includes a first plate member having a radial inner portion, a radial outer portion, and defining a longitudinal axis. The endcap also includes a flange disposed between the radial inner and outer portions, and projecting axially along the longitudinal axis in a first direction. The endcap also includes a first seal member disposed adjacent the flange. The first seal member includes a first portion engaged with an axial facing surface of the first plate member and a second portion engaged with a radially facing surface of the flange. The endcap further includes a second plate member disposed radially outward of the radial outer portion and a second seal member disposed adjacent the second plate member including at least a portion axially spaced from the axially facing surface of the first plate member in a second direction along the longitudinal axis opposite the first direction.

Abstract: A filter assembly with a replaceable filter element and a reusable filter housing, which incorporates a locking mechanism to ensure that the filter system will not be operated without a filter element installed.

Abstract: A drainable oil filter for an engine of a motor vehicle which comprises a cylindrical canister having a closed first end and a second end adapted to be screwed onto the engine of a motor vehicle. A mechanism on the closed first end of the cylindrical canister is for draining residual oil from the cylindrical canister. After oil in a crankcase of the engine of the motor vehicle is drained and before the second end of the cylindrical canister is unscrewed from the engine of the motor vehicle, the draining mechanism when operated by a person will allow the residual oil in the cylindrical canister to exit safely therefrom into a suitable container, without soiling the person positioned under the draining mechanism.

Abstract: A stormwater filter assembly includes a hood and an outlet tube within the hood for draining filtered stormwater. The outlet tube has a solid wall along at least a portion of its height, and an inlet above the solid wall. A second tube is disposed about the outlet tube defining a flow space therebetween for receiving filtered stormwater. The second tube includes a wall that is perforated along at least a portion of its height that overlaps with the solid wall of the outlet tube such that filtered stormwater that enters the flow space must move upward to enter the outlet tube. A filter media is disposed between the hood and the second tube through which stormwater travels during a filtering operation.

Abstract: A liquid filter with a filter housing (9) with a filter element (8, 108, 208) arranged within. Within the filter element (8, 108, 208) a standpipe (3, 103, 203) is arranged. This standpipe is sealing connected with the filter element, whereby in the connecting range between standpipe and filter element a sealing element (15, 115) is arranged for sealably closing a discharge hole (11) in the housing (9). The sealing element (15, 115) seals the discharge hole and also sealably separates a clean side from a contaminated fluid side by sealing between the standpipe and the filter housing.

Abstract: A filter cartridge has a longitudinal axis. A cartridge housing has first and second shell portions. The first shell portion has a cartridge housing opening and an annular element retention lip which is disposed axially inward of the opening and coaxial with the longitudinal axis. The filter element has a first end cap, a second end cap, and a continuous ring of filter media disposed between the first and second end caps. The first end cap defines a fuel flow port which is coaxial with the longitudinal axis. A plurality of resilient element retention arms extend axially from the first end cap, and surround the fuel flow port. The arms terminate in retention barbs which are mateable with the annular lip. The resilient retention arms hold the retention barbs against the annular lip, suspending the filter element within the cartridge.

Abstract: A filter element disclosed herein includes a center tube defining a central reservoir and including an interior sidewall. The filter element further includes an end plate and a pocket defining a port extending from the end plate into the central reservoir. The pocket includes an inner wall, an outer wall, and a plurality of projections extending from the outer wall of the pocket toward the interior sidewall of the center tube.

Abstract: A filtration system includes a housing having an inlet, an outlet, a first chamber fluidly connected to the inlet, a second chamber fluidly connected to the outlet, and a wall separating the first and second chambers. The system also includes a removable filter assembly, at least a portion of the filter assembly being disposed within the first chamber of the housing. The system further includes a lid removably connected to the housing. The lid includes a passage fluidly connecting the first and second chambers.

Abstract: A fluid filter has an outer case with a side wall, a closed first end wall, and a second end wall defining fluid inlet and outlet openings, as well as a filter cartridge received within the outer case. The filter cartridge includes a substantially cylindrical full flow filter element, providing for passage of a major portion of fluid entering the filter, and a substantially cylindrical bypass filter element, providing for passage of a minor portion of fluid entering the filter and disposed radially within and surrounded circumferentially by the full flow filter element. By way of the particular fluid filter configuration disclosed, a simple alternative to known filters having full flow and bypass filters located in common housings is provided.

Abstract: An apparatus may include a heat exchanger and an equalizing vessel for equalizing changes in coolant volume. The heat exchanger may include an inflow for delivering coolant to the heat exchanger and an outflow for discharging coolant from the heat exchanger. The equalizing vessel may be closed off by a flexible membrane that follows changes in volume of the coolant. The equalizing vessel may include a first chamber that is in liquid communication with the inflow of the heat exchanger and a second chamber that is in liquid communication with the outflow of the heat exchanger. A filter may also be provided to filter the coolant.

Abstract: A filter assembly with a replaceable filter element and a reusable filter housing, which incorporates a locking mechanism to ensure that the filter system will not be operated without a filter element installed.

Abstract: A liquid filter cartridge is provided. Preferred seal arrangements are provided, to provide for preferred axial load conditions, with respect to one or more of the end caps of the cartridge. Some cartridge configurations provided include no core structure or outer liner structure therein, to support axial load. Assemblies using the cartridge, and methods of assembly and use, are provided. The liquid filter cartridge can be a serviceable cartridge, or it can be retained permanently in a housing.

Abstract: In a filter element (10) having a filter bellows (11) which is covered at each end by an end disk (13, 14), the end disks (13, 14) are each provided with at least one coupling element for coupling to a filter housing (20) and connected to one another via at least one central tube (12) spanning the filter bellows (11). Alternatively, a central tube which runs right through and onto which end disks and filter bellows are pushed and which is configured at its ends for coupling with parts of the housing is present.

Abstract: An endcap including a first plate member including a radial inner portion, a radial outer portion, and defining a longitudinal axis. The endcap also includes a flange disposed between the radial inner and outer portions of the first plate member and projecting axially along the longitudinal axis in a first direction. The endcap also includes a first seal member disposed adjacent the flange. The first seal includes a first portion thereof engaged with an axial facing surface of the first plate member and a second portion thereof engaged with a radially facing surface of the flange. The endcap further includes a second plate member disposed radially outward of the radial outer portion and a second seal member disposed adjacent the second plate member including at least a portion thereof axially spaced from the axially facing surface of the first plate member in a second direction along the longitudinal axis opposite the first direction.

Abstract: A drainless reverse osmosis (RO) water purification system provides relatively pure water for on-demand dispensing, while recycling brine to a domestic hot water system. The drainless purification system includes a pre-filter catalyst cartridge for removing chlorine-based contaminants from a tap water supply upstream from an RO membrane. The catalyst is regularly refreshed by a high through-flow of water to a conventional cold water dispense faucet, thereby significantly prolonging the service life of the RO membrane. The RO membrane is incorporated into a multi-cartridge unit adapted for facilitated slide-out removal and replacement as needed. A control valve recycles brine from the RO membrane to the hot water system during pure water production, and recirculates tap water through the RO membrane when a pure water reservoir is substantially filled. The multi-cartridge unit may further include an air filtration system for providing a flow of filtered air.

Abstract: The invention relates to a filter cartridge (1) which comprises a firmly fixed lid (10) and has a long service life. Said lid (10) is embodied in such a way that the bottom (11) of the lid extends towards the peripheral wall (3) of the cartridge container to join the lateral wall (16) of the lid, by means of an inwardly curved edge section (14), the curved edge section (14) and the lateral wall (16) in the form of a strip joining in the forming region to form an inwardly tapered common wall section (15). In this way, the region fixing the lateral wall (16) to the peripheral wall (3) is subjected only to a tensile load, minimizing the risk of shear fracture, and the inner pressure in the region of the common wall section (15) presses the wall section against the peripheral wall (3), thus exerting an additional sealing force.

Abstract: A liquid filter, with a housing inlet port and outlet port arranged at the bottom of the liquid filter. The liquid filter may also be configured with an inward projecting domed top cover and/or an eccentric septum plate supporting a desired filter element and/or filter basket. The inward projecting domed top cover configurable with respect to the septum plate to retain the desired filter element and/or filter basket in place when in a closed position.

Abstract: A compressed air filter adapter for connecting a filter element (12) to a filter connection housing (13) includes a flow duct (21) enclosed by a wall (20) for compressed air, the flow duct (21) at a first end being delimited by a first opening (14), having an inner contour (142) defined by a first edge (141) and an outer contour (143), and at a second end by a second opening (15), having an inner contour (152) defined by a second edge (151) and an outer contour (153). The first opening (14) is provided for connection to a filter connection housing (13) and forms an opening cross-section (16), defined by the inner contour (142) of the first opening (14). The second opening (15) defines an opening on the filter side and forms a second opening cross-section (17), defined by the inner contour (152) of the second opening (15).

Abstract: A filter element for filtering liquids or gases, having a concentrically arranged filter medium with zigzag pleats. The filter medium is provided with end disks on its axial end faces, each end disk having an inside that is connected to the filter medium and an outside that faces away from the filter medium. At least a first end disk carries a valve element which is situated concentrically inside the filter medium. This valve element includes a valve seat which bulges outward above the plane of the outer side of the end disk. The valve element includes a valve body which cooperates with the valve seat and which is arranged on the first end disk so that it is axially movable and is inside of and surrounded by the filter medium.

Abstract: A spin-on filter cartridge includes a housing, a filter element operably oriented in the housing, a baffle plate, and a seal arrangement. The baffle plate is operably oriented over the housing open end and defines a central flow aperture. The baffle plate also defines a continuous groove immediately adjacent to and circumscribing the central flow aperture. The seal arrangement is secured to the baffle plate and spaced from and circumscribing the continuous groove. A filter assembly including the spin-on filter cartridge and a filter head is also disclosed wherein the filter cartridge is removably mountable on the filter head. When the spin-on filter cartridge is oriented on the filter head, a seal member is received within the continuous groove and the seal arrangement forms a seal between and against the baffle plate and the filter head. The seal can be radial or axial or have both axial and radial components.

Abstract: A liquid filter has a filter housing with a first thread and a drain passage. A filter element including a filter medium is arranged in the filter housing. A filter lid is provided with a second thread configured to engage the first thread for connecting the filter lid to the filter housing. The filter lid further has a filter bypass valve for bypassing the filter element when a pressure loss that is too high occurs when liquid passes through the filter medium of the filter element. First bayonet connectors are provided on the filter lid and second bayonet connectors are provided on the filter element for connecting the filter element to the filter lid by engaging the first bayonet connectors. A double-concentric seal is arranged on the filter element for closing off the drain passage.

Abstract: An endcap including a first plate member including a radial inner portion, a radial outer portion, and defining a longitudinal axis. The endcap also includes a flange disposed between the radial inner and outer portions of the first plate member and projecting axially along the longitudinal axis in a first direction. The endcap also includes a first seal member disposed adjacent the flange. The first seal includes a first portion thereof engaged with an axial facing surface of the first plate member and a second portion thereof engaged with a radially facing surface of the flange. The endcap further includes a second plate member disposed radially outward of the radial outer portion and a second seal member disposed adjacent the second plate member including at least a portion thereof axially spaced from the axially facing surface of the first plate member in a second direction along the longitudinal axis opposite the first direction.

Abstract: A filter assembly for filtering particulate contaminants from a fluid comprises: a generally cylindrical filter unit with one end closed and the other end open; a filter head comprising a generally cylindrical sleeve extending generally horizontally an open end for receiving the open end of the filter unit with that has a vent port aligned with a vertical axis through an upper portion of the sleeve and a drain port aligned with the vertical axis extending through a lower portion of the sleeve; and a coupling for securing the open end of the filter unit to the filter head to seal the sleeve vent and drain ports; wherein loosening the coupling allows the filter unit to slide away from the filter head sufficiently to establish fluid communication between the sleeve vent and drain ports.

Abstract: A liquid filter assembly including a first liquid filter element adapted to filter particles larger than a first size; a second different liquid filter element adapted to filter particles larger than a second size; a housing having the first and second liquid filter elements therein. The second size is smaller than the first size. The housing forms a first liquid flow path having the first liquid filter element therein, and a second liquid flow path having the second liquid filter element therein. The second filter element comprises a formed porous polymer member.

Abstract: Fluid treatment elements and assemblies include a spring-biased electrical contact arrangement to dissipate electrical charge from the fluid treatment pack and/or the end caps to the housing.

Abstract: A liquid filter cartridge is provided. Preferred seal arrangements are provided, to provide for preferred axial load conditions, with respect to one or more of the end caps of the cartridge. Some cartridge configurations provided include no core structure or outer liner structure therein, to support axial load. Assemblies using the cartridge, and methods of assembly and use, are provided. The liquid filter cartridge can be a serviceable cartridge, or it can be retained permanently in a housing.

Abstract: Flow-through device for fluids, consisting of: a housing (2) which is built of a head (3) with an inlet channel (5) and an outlet channel (8); and a pot (4) which can be provided on the head (3) and in which is provided a cartridge which consists of an active flow-through element (20) and a cap (21) defining a flow-through channel (22) with an inlet opening (23) and an outlet opening (24), whereby the inlet opening (23) of the flow-through channel (22) is eccentric in relation to the axis (B-B?) of the flow-through element (20), whereas the outlet opening (24) is centrally positioned; and whereby the flow-through section of the flow-through channel (22) as of the inlet opening (23) to the outlet opening (24) first decreases and then increases again.

Abstract: A liquid filter has a filter housing with a first thread and a drain passage. A filter element including a filter medium is arranged in the filter housing. A filter lid is provided with a second thread configured to engage the first thread for connecting the filter lid to the filter housing. The filter lid further has a filter by pass valve for bypassing the filter element when a pressure loss that is too high occurs when liquid passes through the filter medium of the filter element. First bayonet connectors are provided on the filter lid and second bayonet connectors are provided on the filter element for connecting the filter element to the filter lid by engaging the first bayonet connectors. A double-concentric seal is arranged on the filter element for closing off the drain passage.

Abstract: A canister filter system includes a base, a canister attachable to the base, and positioned inside the canister a filter element having filter media. A drain engages and forms a seal with the filter element in a closed position. In an open position, the drain allows fluid to be removed from the canister. Because the drain is engaged to and forms a seal with the filter element in the closed position, the drain cannot be closed unless a filter element is present inside the canister. This prevents accidental or intentional use of the filter system without a filter element in place.

Abstract: The invention relates to a filter element, consisting of a filter medium (10) that is pleated in a zigzag manner and has a concentric form, and an end disk (11) disposed on a front, and a second end disk (12) disposed on the opposite front, wherein the end disk (12) has a concentric opening (13) and extends substantially annularly across the pleats of the filter medium. The end disk (12) has a ring collar (14) extending radially toward the outside. The ring collar (14) has a seal (15) that surrounds the ring collar at least partially, wherein the seal has an axially extending region, which carries radially peripheral sealing lips (17), and said radially peripherals sealing lips are supported in a groove (18) or in a housing wall (19) of a housing receiving the filter element.

Abstract: A canister filter system includes a base, a canister attachable to the base, and a fluid separator filter having filter media positioned inside the canister. A drain engages and forms a seal with the filter in a closed position. In an open position, the drain allows fluid to be removed from the canister. The structure of the filter is such that the filter may more efficiently separate fluids.

Abstract: The invention relates to a filter element consisting of a filter medium (10) that is pleated in a zigzag manner and has a concentric shape, and a first end disk (11) and a second end disk (12) disposed on an opposite front, wherein the end disk (12) has a concentric opening (13) and extends substantially annularly across the pleats of the filter medium. The end disk (11) has a ring collar (14) extending radially toward the outside. Said ring collar (14) has a seal (15) that surrounds the ring collar at least partially, wherein the seal has an axially extending region, which carries radially peripheral sealing lips (17), and said radially peripheral sealing lips are supported in a groove (18) or in a housing wall (19) of a housing receiving the filter element.

Abstract: The invention relates to a filter element consisting of a filter medium (10) which is folded in a zig-zag manner and designed in a concentric shape. End plates (11, 12) are arranged on the end sides of the medium. End plate (12) has a concentric opening as well as a first annular ring (14) and a second annular ring (15), and a sealing groove (16) arranged between the rings. A reinforcement plate (17) is arranged in the area between the filter medium and the rings (14, 15). The end surfaces (18, 19) of the rings (14, 15) are supported by the grooves (20, 21) of a filter element housing, the grooves running radially.

Abstract: The present disclosure pertains to a fluid filter having a gasket locator such as a cylindrical wall on the underside of the baseplate which positions and supports an internal gasket.

Abstract: The invention relates to a fuel system of a portable handheld work apparatus driven by an internal combustion engine. The fuel system includes a fuel tank (2), a fuel pump, a fuel line (4) leading from the fuel tank (2) to the fuel pump and a first suction head (5) which is disposed at an end (7) of the fuel line (4) at the fuel tank. At least a second suction head (6) is arranged within the fuel tank (2) and is connected in the fuel line (4) in series ahead of the first suction head (5). The second suction head (6) has an external suction surface which is formed by a porous covering (9). The porous covering (9) delimits a suction space. A guide is arranged in the suction space which guides the through-passing fuel flow at least approximately along the entire inner surface of the porous covering (9).