JP2009228653A - Fuel supply apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply apparatus comprising a plurality of fuel pumps and allowing the filtration area of a suction filter provided in the fuel pumps to be enlarged in a limited space. <P>SOLUTION: The fuel supply apparatus 10 comprises a sub tank 20 stored in a fuel tank 12. Main and sub pumps 31a, 31b are stored in the sub tank 20. The pumps 31a, 31b are connected with suction filters 44a, 44b. The suction filters 44a, 44b are disposed in the sub tank 20 so that a part of element parts 46a, 46b are overlapped in the axial direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fuel supply device that supplies fuel inside a fuel tank to a fuel consuming device (for example, an engine) provided outside the fuel tank.

  A large displacement engine, for example, requires a large amount of fuel temporarily when the engine is started or accelerated. For this reason, it may be difficult to secure the amount of fuel required by the engine in a fuel supply device having only one fuel pump. In order to solve this problem, a fuel supply device having two fuel pumps connected in parallel to the engine has been proposed in order to supply fuel stably (see Patent Document 1).

This fuel supply device is installed in the fuel tank, and directly sucks the fuel in the fuel tank and pumps it to the engine. The fuel supply device has a sub-tank that accommodates two fuel pumps. The two fuel pumps suck the fuel in the sub tank and discharge it toward the engine.
US Pat. No. 7,114,490

  The size of the sub-tank cannot be easily increased. This is because it depends on the specifications of the fuel tank, for example, the size of the fuel tank, the size of the opening formed in the fuel tank for passing the fuel supply device when the fuel supply device is installed in the fuel tank, and the like.

  Incidentally, a suction filter for collecting relatively large foreign matters contained in the fuel is provided on the suction side of the two fuel pumps. Considering supplying a large amount of fuel to a large displacement engine, it is necessary to increase the filtration area of the suction filter.

  However, if two fuel pumps equipped with these suction filters on the suction side are accommodated in the sub tank, it is difficult to secure the filtration area of the suction filter because the space in the sub tank is limited.

  The present invention has been made in view of the above-described problems, and an object of the present invention is a fuel supply device including a plurality of fuel pumps, and a suction filter provided in the fuel pump within a limited space. A fuel supply device capable of increasing the filtration area is provided.

  The invention described in claim 1 is a fuel supply device that is provided in a fuel tank and supplies the fuel in the fuel tank to an external fuel consuming device. The fuel supply device is accommodated in the fuel tank, and the fuel in the fuel tank is supplied. A sub-tank that temporarily stores, a first fuel pump that is contained in the sub-tank and sucks fuel in the sub-tank and discharges toward the fuel consuming device, and a sub-tank that sucks fuel in the sub-tank. A second fuel pump that discharges toward the fuel consuming device, a first suction filter connected to the suction port side of the first fuel pump, and a second suction filter connected to the suction port side of the second fuel pump The first and second fuel pumps are arranged side by side with the inlet sides facing the bottom side of the sub tank, and a part of the first and second suction filters overlap in the axial direction. That It is a symptom.

  According to the present invention, the first and second suction filters are partially overlapped in the axial direction and accommodated in the sub tank. Therefore, one of the suction filters disposed below can expand the element portion in the radial direction without being obstructed by the other suction filter disposed above. That is, the filtration area of the suction filter can be increased as much as possible. According to this, the fuel supply device accommodates two fuel pumps in the sub-tank, and can increase the filtration area of the suction filter as much as possible even when the space in the sub-tank is limited Can provide.

  The invention according to claim 2 is characterized in that the first fuel pump is used more frequently than the second fuel pump, and the first suction filter is disposed closer to the bottom side of the sub tank than the second suction filter. .

  According to the present invention, the suction filter (first suction filter) of the fuel pump (first fuel pump) that is frequently used is disposed closer to the bottom of the sub tank than the other suction filters (second suction filter). Even when the fuel tank and the sub-tank are inclined, the fuel can be stably sucked into the fuel pump that is frequently used.

  The invention described in claim 3 is characterized in that a gap is formed between the first suction filter and the second suction filter.

  According to the present invention, since the gap is formed between the first and second suction filters, both the suction filters can suck the fuel also from this gap. For this reason, the reduction of the filtration area by suction filters mutually contacting can be suppressed.

  According to a fourth aspect of the present invention, the first suction filter includes a first element part that filters fuel, a first connection passage member that connects the discharge port of the first element part and the suction port of the first fuel pump. The second suction filter has a second element part for filtering fuel, and a second connection passage member for connecting the discharge port of the element part and the suction port of the second fuel pump, The one connection passage member is longer than the second connection passage member.

  According to this invention, since the length of the connection passage member that connects the fuel pump and the element portion of the suction filter is made different, a predetermined space can be positively formed below the fuel pump. Thereby, other functional components required for the fuel supply device can be arranged in the formed space. According to this configuration, it is possible to effectively use a limited space in the sub tank.

  According to a fifth aspect of the present invention, the first suction filter includes a first element portion that filters fuel, a first connection passage member that connects the discharge port of the first element portion and the suction port of the first fuel pump. The second suction filter has a second element part for filtering fuel, and a second connection passage member for connecting the discharge port of the element part and the suction port of the second fuel pump, The lengths of the one connection passage member and the second connection passage member are substantially equal, and the first fuel pump and the second fuel pump are characterized by being displaced in the axial direction.

  According to the present invention, in order to displace the first suction filter and the second suction filter in the axial direction, the first fuel pump and the second fuel pump are displaced in the axial direction. For this reason, since a 1st, 2nd connection channel member can be used in common, the increase in the manufacturing cost of a fuel supply apparatus can be suppressed.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
The fuel supply device 10 is installed, for example, in a fuel tank 12 that stores fuel consumed by an engine 11 as a fuel consumption device mounted on a vehicle. A part of the fuel supply device 10 is accommodated in the fuel tank 12. The fuel supply device 10 sucks up the fuel in the fuel tank 12 and discharges it toward the engine 11.

  First, the structure of the fuel supply device 10 will be described. The fuel supply device 10 includes a lid member 14, a sub tank 20, a pump module 30, and the like.

  FIG. 1 is a schematic view showing an outline of a fuel supply apparatus 10 according to the present invention. 2 to 4 are views showing a specific structure of the fuel supply device 10 shown in FIG. FIG. 2 is a side view showing only the lid member 14 and the pump module 30 in the fuel supply apparatus 10, and is a view seen from the II direction shown in FIG. FIG. 3 is a side view showing only the lid member 14 and the pump module 30 as in FIG. 2, and is a view seen from the III direction shown in FIG. 4. FIG. 4 is a top view of the pump module 30 and the sub tank 20 as seen from the IV direction illustrated in FIGS. 2 and 3.

  As shown in FIGS. 1 to 3, the lid member 14 is formed in a disk shape with resin, and is attached so as to close the opening 13 formed in the top wall of the fuel tank 12. Other components of the fuel supply device 10 are accommodated in the fuel tank 12. The sub tank 20 is accommodated in the fuel tank 12, and the pump module 30 is accommodated in the sub tank 20 except for a part.

  A fuel discharge pipe 15 and electrical connectors 16a and 16b are integrally molded with the lid member 14 by resin. The fuel discharge pipe 15 is a pipe that supplies the fuel inside the sub tank 20 discharged from the pump module 30 to the outside of the fuel tank 12. The electrical connectors 16a and 16b are electrically connected to power receiving connectors (not shown) provided in the main pump 31a and the sub pump 31b included in the pump module 30 by power feeding lines 17a and 17b and a power feeding connector (not shown). They are connected and supply power to both pumps 31a, 31b.

  As shown in FIGS. 1 and 4, the sub-tank 20 is a container that temporarily stores the fuel in the fuel tank 12 that is formed in a bottomed cylindrical shape that is open on the top wall side of the fuel tank 12. As shown in FIG. 1, the sub tank 20 accommodates most of the pump module 30.

  As shown in FIG. 4, an opening 22 that communicates the inside and outside of the sub tank 20 is formed at the bottom 21 of the sub tank 20. The opening 22 is provided with an open / close valve 23 that opens and closes due to the internal / external differential pressure of the sub tank 20.

  The on-off valve 23 opens when the pressure outside the sub tank 20 is higher than that inside the sub tank 20, and closes when the pressure outside the sub tank 20 is lower than inside. As a result, even if the pump module 30 sucks the fuel inside the sub tank 20 and supplies it to the engine 11 to reduce the liquid level inside the sub tank 20, the fuel is supplied to the outside of the sub tank 20 through the opening 22. More supplied. The fuel supplied to the inside of the sub tank 20 does not flow out of the sub tank 20 by the opening / closing valve 23.

  As shown in FIGS. 1 to 3, the pump module 30 is connected to the fuel discharge pipe 15 of the lid member 14 by a feed tube 36, sucks fuel inside the sub tank 20, and sets the fuel pressure to a predetermined pressure. And discharge toward the engine 11. The pump module 30 uses a part of the fuel sucked by the pump module 30 as a drive source, drives a jet pump 37 as a pumping means described later, and pumps fuel outside the sub tank 20 into the sub tank 20.

  The pump module 30 includes a main pump 31a, a sub pump 31b, a jet pump 37, a fuel filter 40, a pressure regulator 42, and the like. The main pump 31a, the sub pump 31b, and the fuel filter 40 are accommodated in the case 50 and the cover 62.

  As shown in FIGS. 2 and 3, a flange 51 is formed at the upper end of the case 50. The flange 51 is formed with a plurality of engaging portions 52 that engage with the upper end opening of the sub tank 20. With this configuration, the pump module 30 and the sub tank 20 are combined and integrated.

  As shown in FIGS. 2 and 3, a pipe support portion 53 that supports two support pipes 60 attached to the lid member 14 is provided on the side wall of the case 50. One end of each of these support pipes 60 is loosely inserted into each pipe support 53. Each of the support pipes 60 is provided with a spring 61 that urges the cover member 14 and the pump module 30 to be separated from each other between the pipe support portion 53 and the cover member 14.

  With these configurations, when the sub tank 20 and the pump module 30 are accommodated in the fuel tank 12 and the lid member 14 is attached to the opening 13 of the fuel tank 12, the sub tank 20 is pressed against the bottom of the fuel tank 12. Since the support pipe 60 is loosely inserted into the pipe support portion 53 and the support pipe 60 is provided with a spring 61, the resin fuel tank 12 expands and contracts due to a change in internal pressure or a change in fuel amount due to a temperature change. Even so, the bottom 21 of the sub-tank 20 is always pressed against the bottom of the fuel tank 12.

  The main pump 31a and the sub pump 31b have a motor as an electric drive unit (not shown) inside and a plurality of blades formed on the outer periphery, and have impellers 32a and 32b rotated by the motor. As the impellers 32a and 32b are rotated by a motor, both pumps 31a and 31b generate a fuel suction force.

  As shown in FIG. 1, the main pump 31a and the sub pump 31b have suction ports 33a and 33b formed at one end and discharge ports 34a and 34b formed at the other end, respectively. As the impellers 32a and 32b are rotated by the respective motors, a fuel suction force is generated in both the pumps 31a and 31b, and the fuel inside the sub tank 20 is sucked from the suction ports 33a and 33b. The fuel sucked into both the pumps 31a and 31b is discharged from the discharge ports 34a and 34b while being pressurized to a predetermined pressure. In addition, check valves 35a and 35b for suppressing the backflow of fuel from the discharge ports 34a and 34b to the suction ports 33a and 33b are provided inside the discharge ports 34a and 34b of both pumps 31a and 31b (FIG. 1).

  In the present embodiment, the main pump 31a is a pump that is always driven while the engine 11 is operating, and has a discharge capacity of 200 L / hour. On the other hand, the sub-pump 31b is a pump that is driven when a large amount of fuel needs to be consumed, for example, when the engine is started or accelerated, according to the operating state of the engine 11, and has a discharge capacity of 140L per hour.

  As shown in FIGS. 2 to 4, the main pump 31 a and the sub pump 31 b are arranged so that the axial direction of both pumps 31 a and 31 b in the case 50 and the axial direction of the case 50 formed in a cylindrical shape face the same direction. In the case 50. The suction ports 33a and 33b of both pumps 31a and 31b are directed toward the bottom 21 of the sub tank 20.

  A fuel inflow portion (not shown) connected to the discharge ports 34a and 34b of both pumps 31a and 31b is formed at the upper end portion of the case 50. These fuel inflow portions extend toward the upper end surface of the case 50 and open at the upper end surface. An opening 55 for supplying fuel discharged from both pumps 31a and 31b to a jet pump 37, which will be described later, is formed on the upper end surface of the case 50 separately from the opening of the fuel inflow portion (see FIG. 4).

  A cover 62 is attached to the upper end surface of the case 50. As shown in FIG. 4, the cover 62 covers the fuel inflow portions of both the pumps 31 a and 31 b and the opening 55, and also covers the inlet portion of the fuel filter 40 accommodated in the case 50. As a result, a space communicating the two fuel inflow portions, the opening 55, and the inlet portion of the fuel filter 40 is formed. In this space, a joining portion 63 is formed in which fuel discharged from both pumps 31a and 31b joins (see FIG. 4).

  According to this configuration, the fuel discharged from the main pump 31a flows into the space through the fuel inflow portion and into the fuel filter 40 as shown in FIG. As shown in FIG. 4, the fuel discharged from the sub-pump 31 b flows into the space through the fuel inflow portion and flows into the fuel filter 40. The fuel path described above is shown as the flow path 65 in FIG. The junction 63 provided in the middle of the flow path 65 is the junction 63 shown in FIG.

  As shown in FIG. 3, a fuel passage portion 54 is formed so as to protrude from the side wall of the case 50. The fuel passage portion 54 includes an opening 55 (see FIG. 4) formed in the upper end surface of the case 50 described above inside the case 50, and a tube 39 connected to the ejection member 38 of the jet pump 37. To connect. As shown in FIGS. 1 and 4, the ejection member 38 is attached to the outside of the sub tank 20 so as to eject fuel from the outside of the opening 22 of the sub tank 20 toward the inside of the sub tank 20.

  A part of the fuel discharged from both pumps 31a and 31b is supplied to the ejection member 38. The fuel discharged from both pumps 31 a and 31 b is supplied to the ejection member 38 through the fuel inflow portion, the space formed between the case 50 and the cover 62, the fuel passage portion 54, and the tube 39. When the fuel is ejected from the ejection member 38, the fuel outside the sub tank 20 flows into the sub tank 20 through the opening 22 while being dragged by the flow of fuel ejected from the ejection member 38. In this way, the fuel outside the sub tank 20 is forcibly pumped into the sub tank 20. The fuel path guided to the jet pump 37 is shown as a flow path 66 in FIG. This flow path 66 is branched from the flow path 65 described above.

  As shown in FIGS. 2 and 3, one bracket 64 that supports the lower ends of the pumps 31 a and 31 b is attached to the lower end of the case 50. This prevents both pumps 31a and 31b from falling out of the case 50.

  A main suction filter 44a and a sub suction filter 44b are attached to the tips of the respective suction ports 33a and 33b. The suction filters 44a and 44b collect relatively large foreign matters contained in the fuel sucked from the sub tank 20 by the two pumps 31a and 31b.

  The suction filters 44a and 44b are composed of fuel passage members 45a and 45b connected to the suction ports 33a and 33b and element portions 46a and 46b connected to the fuel passage members 45a and 45b, respectively. In this embodiment, the length of the fuel passage member 45a connected to the main pump 31a is longer than that of the fuel passage member 45b connected to the sub pump 31b. The length of the fuel passage member 45a is such that a pressure regulator 42 for adjusting the pressure of the fuel flowing out from the fuel filter 40 is attached in a space formed between the lower side of the case 50 and the upper surface of the element portion 46a. It is as long as possible.

  The size of the projected area in the axial direction of the element portion 46a is larger than that of the element portion 46b. In the state where the suction filters 44a and 44b are attached to both the pumps 31a and 31b, the element portion 46a and the element portion 46b partially overlap each other in the axial direction. Furthermore, as shown in FIGS. 1 to 3, the two element portions 46 a and 46 b are separated from each other in the axial direction.

  Both element parts 46a and 46b are made of a nonwoven fabric formed of fibers of a resin material rich in oil resistance such as PET resin (polyethylene terephthalate) or polyamide resin. The element portions 46a and 46b are formed in a bag shape so as to have a space inside.

  In the present embodiment, each of the element portions 46a and 46b is formed in a bag shape by folding one sheet of nonwoven fabric in half and welding the outer periphery of the folded piece by ultrasonic welding or the like. By making the element portions 46a and 46b into a bag shape, it is possible to increase the filtration area compared to a bag shape.

  The fuel filter 40 collects relatively small foreign matters contained in the fuel discharged from both the pumps 31a and 31b. In the present embodiment, the fuel filter 40 includes two cylindrical filter element portions 41a and 41b. As shown in FIG. 4, the filter element portions 41 a and 41 b are accommodated in the case 50 so that their axial directions are in the same direction as the axial direction of the case 50. The fuel discharged from both pumps 31a and 31b flows into these filter element portions 41a and 41b.

  As shown in FIG. 3, a feed tube 36 that guides the fuel flowing out from the fuel filter 40 to the fuel discharge pipe 15 is connected to the lower end portion of the case 50. A pressure regulator 42 is attached below the pressure regulator 42 for adjusting the pressure of the fuel discharged from both pumps 31a and 31b and flowing out of the fuel filter 40 to a predetermined pressure (see FIGS. 2 and 3).

  The pressure regulator 42 is attached to the lower side of the fuel filter 40. Excess fuel generated when the pressure regulator 42 adjusts the pressure of the fuel is discharged from a discharge port 43 provided in the pressure regulator 42. The discharge port 43 is accommodated in the sub tank 20.

  The fuel discharged from the main pump 31a and the sub pump 31b merges in a flow path 65 (see FIG. 1) formed by the case 50 and the cover 62 and flows into the fuel filter 40. The fuel that has flowed out of the fuel filter 40 is guided to the fuel discharge pipe 15 through the feed tube 36 and discharged toward the engine 11.

  Next, the operation of the fuel supply device 10 will be described with reference to FIG. As described above, the fuel supply apparatus 10 includes the main pump 31a and the sub pump 31b. These pumps 31a and 31b are driven and controlled by a control device (not shown).

  For example, the control device determines that the engine 11 requires a large amount of fuel when the engine 11 is started or accelerated, and drives both pumps 31 a and 31 b to supply a large amount of fuel to the engine 11. Further, the control device determines that the engine 11 does not require a large amount of fuel during idle operation, low speed operation, constant speed operation, or low load operation, and supplies an appropriate amount of fuel to the engine 11. Only the main pump 31a is driven.

  Hereinafter, the operation of the fuel supply device 10 will be described separately when both the pumps 31a and 31b are driven and when only the main pump 31a is driven.

(Main pump 31a and sub pump 31b are driven)
When the main pump 31a and the sub pump 31b are driven, a fuel suction force is generated in both the pumps 31a and 31b, and the fuel in the sub tank 20 flows into the both pumps 31a and 31b through the suction filters 44a and 44b. The fuel flowing into both pumps 31a and 31b is pressurized by both pumps 31a and 31b and discharged from the discharge ports 34a and 34b. The fuel discharged from the discharge ports 34a and 34b flows into the fuel filter 40 through the flow path 65 (see FIG. 1).

  At this time, part of the fuel discharged from the discharge ports 34 a and 34 b of both pumps 31 a and 31 b flows into the ejection member 38 through the flow channel 66 branched from the flow channel 65. The fuel that has flowed into the ejection member 38 is ejected from the ejection member 38 toward the opening 22 of the sub tank 20, and fuel outside the sub tank 20 is pumped into the sub tank 20.

  The fuel that has passed through the fuel filter 40 is adjusted to a predetermined pressure by the pressure regulator 42 and flows into the fuel discharge pipe 15 through the feed tube 36. The fuel flowing into the fuel discharge pipe 15 is supplied to the engine 11 through the fuel pipe 18.

(Only the main pump 31a is driven)
When the main pump 31a is driven, a fuel suction force is generated only in the main pump 31a, and the fuel inside the sub tank 20 flows into the main pump 31a through the main suction filter 44a. The fuel flowing into the main pump 31a is pressurized by the main pump 31a and discharged from the discharge port 34a. The fuel discharged from the discharge port 34 a flows into the fuel filter 40 through the flow path 65. At the same time, the fuel discharged from the discharge port 34 a flows into the ejection member 38 through the flow path 66. The fuel that has flowed into the ejection member 38 is ejected from the ejection member 38 toward the opening 22 of the sub tank 20, and fuel outside the sub tank 20 is pumped into the sub tank 20.

  The fuel that has passed through the fuel filter 40 is adjusted to a predetermined pressure by the pressure regulator 42 and flows into the fuel discharge pipe 15 through the feed tube 36. The fuel flowing into the fuel discharge pipe 15 is supplied to the engine 11 through the fuel pipe 18.

  Next, the function and effect of the characteristic part of the fuel supply device 10 according to the present embodiment will be described.

  The first feature of the present embodiment is that a part of the element portion 46a of the main suction filter 44a and a part of the element portion 46b of the sub suction filter 44b are accommodated in the sub tank 20 overlapping in the axial direction. According to this feature, even in a state where the capacity of the sub tank 20 cannot be easily increased, the filtration area of the element portion 46a disposed below can be increased as much as possible. According to this, the fuel supply device 10 accommodates two fuel pumps (the main pump 31a and the sub pump 31b) in the sub tank 20, and other elements even when the space in the sub tank 20 is limited. Since interference with the portion 46b can be prevented, the filtration area of the element portion 46a of the main suction filter 44a can be increased as much as possible.

  In the present embodiment, the element portion 46a connected to the main pump 31a that is always driven during operation of the engine 11 is disposed below the element portion 46b connected to the sub pump 31b. According to this, for example, even when the fuel tank 12 and the sub tank 20 are inclined, the main pump 31 a can stably suck the fuel and supply it to the engine 11.

  Moreover, since the clearance gap is formed between the element part 46a and the element part 46b, the reduction | decrease of the filtration area by element part 46a, 46b contacting can be suppressed.

  In the present embodiment, the length of the fuel passage member 45a of the main suction filter 44a is longer than that of the fuel passage member 45b. For this reason, another functional component, for example, the pressure regulator 42, can be disposed below the main pump 31a. According to this configuration, a limited space in the sub tank 20 can be used effectively.

(Second Embodiment)
Next, a second embodiment will be described. Components that are substantially the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. Here, only characteristic parts of the second embodiment will be described.

  In the second embodiment shown in FIG. 5, the main pump 31a and the sub pump 31b are arranged so as to be shifted in the axial direction. In the present embodiment, the main pump 31a is disposed below the sub pump 31b. The shape of the case 50a is a shape extended downward by an amount corresponding to the downward shift of the main pump 31a. And the shape of the bracket 64a is also a shape according to it.

  According to this configuration, since both pumps 31a and 31b are shifted in the axial direction, the fuel passage members 45c and 45d provided in the main suction filter 44c and the sub suction filter 44d can be made common. . For this reason, since parts in the suction filters 44c and 44d can be shared, an increase in manufacturing cost can be suppressed.

It is the schematic which showed the outline of the fuel supply apparatus by 1st embodiment of this invention. It is the side view which showed only the cover member and the pump module among the fuel supply apparatuses shown in FIG. 1, and is the side view seen from the II direction shown in FIG. It is the side view which showed only the cover member and the pump module among the fuel supply apparatus shown in FIG. 1, and is the side view seen from the III direction illustrated in FIG. FIG. 4 is a top view of the pump module and the sub tank as viewed from the IV direction illustrated in FIGS. 2 and 3. It is the side view which showed only the cover member and the pump module among the fuel supply apparatuses by 2nd embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Fuel supply apparatus, 11 Engine, 12 Fuel tank, 14 Cover member, 20 Sub tank, 30 Pump module, 31a Main pump, 31b Sub pump, 33a * 33b Suction port, 34a * 34b Discharge port, 36 Feed tube, 37 Jet pump, 38 jetting member, 39 tube, 40 fuel filter, 42 pressure regulator, 44a main suction filter, 44b sub suction filter, 45a / 45b fuel passage member, 46a / 46b element part, 50 case, 55 opening, 60 support pipe, 61 Spring, 62 cover, 64 bracket, 65 flow path, 66 flow path

Claims (5)

A fuel supply device that is provided in a fuel tank and supplies fuel in the fuel tank to an external fuel consuming device,
A sub-tank housed in the fuel tank and temporarily storing fuel in the fuel tank;
A first fuel pump that is housed in the sub-tank, sucks fuel in the sub-tank, and discharges the fuel toward the fuel consuming device;
A second fuel pump that is housed in the sub-tank, sucks fuel in the partial tank, and discharges the fuel toward the fuel consuming device;
A first suction filter connected to the inlet side of the first fuel pump;
A second suction filter connected to the suction port side of the second fuel pump,
The first and second fuel pumps are arranged side by side with each suction port side facing the bottom side of the sub tank, and parts of the first and second suction filters overlap in the axial direction. A fuel supply device. The first fuel pump is used more frequently than the second fuel pump,
2. The fuel supply apparatus according to claim 1, wherein the first suction filter is disposed closer to a bottom side of the sub tank than the second suction filter.   The fuel supply device according to claim 2, wherein a gap is formed between the first suction filter and the second suction filter. The first suction filter has a first element part for filtering fuel, and a first connection passage member that connects a discharge port of the first element part and a suction port of the first fuel pump,
The second suction filter has a second element part that filters fuel, and a second connection passage member that connects the discharge port of the element part and the suction port of the second fuel pump,
4. The fuel supply device according to claim 1, wherein the first connection passage member is longer than the second connection passage member. 5. The first suction filter has a first element part for filtering fuel, and a first connection passage member that connects a discharge port of the first element part and a suction port of the first fuel pump,
The second suction filter has a second element part that filters fuel, and a second connection passage member that connects the discharge port of the element part and the suction port of the second fuel pump,
The lengths of the first connection passage member and the second connection passage member are substantially equal,
The fuel supply device according to any one of claims 1 to 3, wherein the first fuel pump and the second fuel pump are arranged so as to be displaced in an axial direction.

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