Fuel supply device

Abstract

To suppress vapor lock even when vapor is generated in a fuel supply device caused by the evaporation of fuel.SOLUTION: A fuel supply device (50) comprises a fuel pump (51) delivering fuel from a fuel tank to a fuel passage, a fuel filter (54) located on the downstream side of the fuel passage further than the fuel pump, a branch joint (61) located on the downstream side of the fuel passage further than the fuel filter, and a fuel injection valve (62) injecting the fuel from the downstream end of the fuel passage to an intake passage. In the branch joint, a pair of branch pipes are provided. To one branch pipe, a return pipe (73) is connected for returning the fuel to the fuel pump, and to the other branch pipe, a feed pipe (74) is connected for guiding the fuel to the fuel injection valve. One branch pipe is located at a position higher than the position of the other branch pipe.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a fuel supply system. [Background technology]

[0002] A straddle-type vehicle in which a fuel pump and a fuel filter are installed outside a fuel tank is known (see, for example, Patent Document 1). In the straddle-type vehicle described in Patent Document 1, an engine is installed below the fuel tank, a fuel pump is installed behind the crankcase, and a fuel filter is installed behind the cylinder. Fuel is supplied from the fuel tank through an upstream pipe to the fuel pump, and surplus fuel is returned from the fuel pump to the fuel tank through a return pipe. Fuel is sent from the fuel pump to the fuel filter through a filter pipe, and fuel is sent from the fuel filter to a fuel injection valve through a feed pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5380229 Summary of the Invention [Problem to be solved by the invention]

[0004] In such models, fuel in the fuel filter may evaporate while the vehicle is stopped, generating vapor. If the vapor gets into the feed pipe from the fuel filter, it may prevent fuel from being supplied to the fuel injection valve, causing the engine to stall.

[0005] The present invention has been made in consideration of the above-mentioned points, and has an object to provide a fuel supply device that can suppress vapor lock even if vapor is generated due to evaporation of fuel. [Means for solving the problem]

[0006] One aspect of the present invention is a fuel supply device that supplies fuel from a fuel tank to an intake passage of an engine, and includes a fuel pump that sends fuel in the fuel tank toward the fuel passage, a fuel filter located downstream of the fuel pump in the fuel passage, a branch joint located downstream of the fuel filter in the fuel passage, and a fuel injection valve that injects fuel into the intake passage at the downstream end of the fuel passage, and the branch joint is provided with a pair of branch pipes, one of which is connected to a return pipe that returns fuel to the fuel pump, and the other of which is connected to a feed pipe that guides fuel to the fuel injection valve, and the one of the branch pipes is higher than the other of the branch pipes, thereby solving the above-mentioned problems. Effect of the Invention

[0007] According to the fuel supply device of one aspect of the present invention, even if vapor generated in the fuel filter moves to the branch joint side, the vapor easily moves from one branch pipe to the return pipe side. The vapor is less likely to move from the other branch pipe to the feed pipe side, and the movement of the vapor through the feed pipe to the fuel injection valve side is suppressed. Malfunction of the fuel injection valve due to vapor lock is suppressed, and fuel is appropriately injected from the fuel injection valve into the intake passage, preventing the occurrence of engine stall. [Brief description of the drawings]

[0008] [Figure 1] 1 is a right side view of a vehicle center portion of a saddle-type vehicle according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a right side view of the fuel supply device and its periphery according to the embodiment. [Diagram 3] FIG. 2 is a left side view of the fuel supply device and its periphery according to the embodiment. [Figure 4] FIG. 2 is a right side view of the fuel supply device according to the embodiment. [Diagram 5] FIG. 2 is a top view of the fuel supply device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] In a fuel supply device according to one aspect of the present invention, fuel is supplied from a fuel tank to an intake passage of an engine. A fuel pump delivers fuel from within the fuel tank to the fuel passage, and a fuel injection valve at a downstream end of the fuel passage injects fuel into the intake passage. A fuel filter is located downstream of the fuel pump in the fuel passage, and a branch joint is located downstream of the fuel filter in the fuel passage. The branch joint is provided with one branch pipe and another branch pipe, a return pipe that returns fuel to the fuel pump is connected to one branch pipe, and a feed pipe that introduces fuel to the fuel injection valve is connected to the other branch pipe. One branch pipe is higher than the other branch pipe. Even if vapor generated in the fuel filter moves to the branch joint side, the vapor easily moves from one branch pipe to the return pipe side. It becomes difficult for vapor to move from the other branch pipe to the feed pipe side, and the movement of vapor through the feed pipe to the fuel injection valve side is suppressed. Malfunctioning of the fuel injection valve due to vapor lock is suppressed, and fuel is appropriately injected from the fuel injection valve into the intake passage, thereby preventing the occurrence of engine stall. EXAMPLES

[0010] The saddle-type vehicle of this embodiment will be described below with reference to the accompanying drawings. Fig. 1 is a right side view of the vehicle center portion of the saddle-type vehicle of this embodiment. Note that Fig. 1 shows a state in which some members such as exterior parts have been removed from the saddle-type vehicle. In addition, in the following drawings, the arrow FR indicates the front of the vehicle, the arrow RE indicates the rear of the vehicle, the arrow L indicates the left side of the vehicle, and the arrow R indicates the right side of the vehicle.

[0011] As shown in Fig. 1, the saddle-type vehicle 1 is configured by mounting various parts such as an engine 25 and an electrical system on a backbone-type body frame 10. A main frame 12 extends rearward from a head pipe 11 of the body frame 10, and a pair of pivot frames 13 are connected to a downwardly curved rear portion of the main frame 12. A down frame 14 extends downward from the head pipe 11, and a bracket 15 is connected to a lower portion of the down frame 14. A front portion of the engine 25 is supported by the bracket 15 at the lower portion of the down frame 14, and a rear portion of the engine 25 is supported by brackets 16, 17 provided on the pair of pivot frames 13.

[0012] A pair of upper seat rails 18 extend rearward from the rear of the main frame 12, and a pair of lower seat rails 19 extend diagonally rearward from the middle of the pair of pivot frames 13. The rear parts of the pair of upper seat rails 18 and the rear parts of the pair of lower seat rails 19 are connected to the head pipe 11. A front fork 21 is steerably supported by the head pipe 11 via a steering shaft (not shown), and a front wheel (not shown) is rotatably supported at a lower part of the front fork 21. In addition, a swing arm 22 is swingably supported by the pair of pivot frames 13, and a rear wheel (not shown) is rotatably supported at a rear part of the swing arm 22.

[0013] The engine 25 has a crankcase 26, a cylinder 27 provided on the crankcase 26, a cylinder head 28 provided on the cylinder 27, and a cylinder head cover 29 provided on the cylinder head 28. An air cleaner 34 is connected to the rear surface of the cylinder head 28 via an intake pipe 32, a throttle valve 33, etc. An exhaust pipe 35 extends diagonally downward to the left from the front surface of the cylinder head 28, and passes below the crankcase 26 to be connected to a sound-absorbing chamber 36 at the rear of the vehicle. A muffler 38 inclined upward toward the rear is connected to a tail pipe 37 protruding from the rear of the sound-absorbing chamber 36.

[0014] A fuel tank 41 is installed on the top of the main frame 12, and an ignition coil 42 is installed below the fuel tank 41. An oil cooler 45 (see FIG. 3 in particular) is installed on the left side of the down frame 14, and oil cooler pipes 46, 47 and wiring for the ignition coil 42 are located behind the oil cooler 45. The fuel tank 41 and the intake pipe 32 are connected via various pipes of a fuel supply device 50. A fuel pump 51 (see FIG. 2) upstream of the fuel supply device 50 is attached to the fuel tank 41, and a fuel injection valve 62 downstream of the fuel supply device 50 is attached to the intake pipe 32, and fuel is supplied from the fuel tank 41 to an intake passage of the engine 25.

[0015] By the way, there are saddle-type vehicles that can use gasoline, alcohol, or a mixture of gasoline and alcohol as fuel. In such saddle-type vehicles, a fuel filter is provided on the outside of the fuel tank in addition to the inside of the fuel tank. Highly volatile fuel such as alcohol vaporizes in the fuel filter, which may cause a malfunction of the fuel injection valve due to vapor lock. In particular, when the vehicle is stopped after high-load operation, the fuel filter is warmed by the heat of the engine and exhaust system parts, which makes it easy for vapor to be generated. Therefore, in the fuel supply device 50 of this embodiment, even when alcohol fuel or the like is used, vapor lock is effectively suppressed by ingenious piping.

[0016] The peripheral structure of the fuel supply device will be described below with reference to Figures 2 and 3. Figure 2 is a right side view of the fuel supply device and its periphery of the present embodiment. Figure 3 is a left side view of the fuel supply device and its periphery of the present embodiment.

[0017] 2 and 3, in the fuel supply device 50, a fuel passage is formed by a plurality of pipes connecting the fuel pump 51 and the fuel injection valve 62. The fuel pump 51 is inserted in the fuel tank 41 (see FIG. 1) above the air cleaner 34, and the fuel in the fuel tank 41 is sent out by the fuel pump 51 toward the fuel passage. A cylindrical fuel filter 54 is installed above the cylinder head cover 29, and impurities, moisture, and the like are removed from the fuel downstream of the fuel pump 51 in the fuel passage. In a front view, the outer end of the fuel filter 54 is located outside (to the right) of the cylinder head cover 29 in the vehicle width direction.

[0018] A filter cushion 57 is attached to the outer peripheral surface of the fuel filter 54, and the filter cushion 57 is supported on the main frame 12 via a filter bracket 75 described later. A T-shaped branch joint 61 is held in a pair of holding portions 58 of the filter cushion 57, and the fuel passage is branched into two by the branch joint 61 downstream of the fuel passage from the fuel filter 54. One fuel passage extends toward the fuel pump 51, and the other fuel passage extends toward a fuel injection valve 62. The fuel injection valve 62 is inserted in the intake pipe 32, and fuel is injected into the intake passage by the fuel injection valve 62 at the downstream end of the fuel passage.

[0019] An upstream filter pipe 71 extending from the discharge pipe 52 of the fuel pump 51 is connected to the inlet pipe 55 of the fuel filter 54, and a downstream filter pipe 72 extending from the outlet pipe 56 of the fuel filter 54 is connected to the vertical main pipe of the branch joint 61. The upstream filter pipe 71 and the downstream filter pipe 72 guide fuel from the fuel pump 51 through the fuel filter 54 to the branch joint 61. A return pipe 73 that returns fuel to the suction pipe 53 of the fuel pump 51 is connected to the forward branch pipe (one branch pipe) of the branch joint 61, and a feed pipe 74 that guides fuel to the fuel injection valve 62 is connected to the backward branch pipe (the other branch pipe) of the branch joint 61.

[0020] Above the fuel filter 54, the coil bracket 44 and the filter bracket 75 are fastened together to the main frame 12 with bolts. The coil bracket 44 supports the ignition coil 42, which is connected to the plug cover 31 of the engine 25 via a high-tension cord 43. The filter bracket 75 extends downward beyond the coil bracket 44, and a filter cushion 57 is inserted into the lower end of the filter bracket 75 to support the fuel filter 54. The fuel filter 54 is positioned below the ignition coil 42 and outboard of the ignition coil 42 in the vehicle width direction.

[0021] Next, the fuel supply device will be described in detail with reference to Figures 4 and 5. Figure 4 is a right side view of the fuel supply device of this embodiment. Figure 5 is a top view of the fuel supply device of this embodiment.

[0022] 4 and 5, the fuel injection valve 62 is located forward of the fuel pump 51, and the fuel filter 54 and the branch joint 61 are located forward of the fuel injection valve 62. The fuel pump 51 and the fuel injection valve 62 are located in the center in the vehicle width direction, the fuel filter 54 is located outboard of the fuel pump 51 and the fuel injection valve 62 in the vehicle width direction, and the branch joint 61 is located outboard of the fuel filter 54 in the vehicle width direction. In addition, the fuel pump 51 is attached to the lower surface of the fuel tank 41 (see FIG. 1), and the branch joint 61, the fuel filter 54, and the fuel injection valve 62 are arranged in this order downward from the fuel pump 51.

[0023] The discharge pipe 52 of the fuel pump 51 is positioned on one side (left side) in the vehicle width direction, and the suction pipe 53 of the fuel pump 51 is positioned on the other side (right side) in the vehicle width direction. The inlet pipe 55 of the fuel filter 54 is positioned on the front side, and the outlet pipe 56 of the fuel filter 54 is positioned on the rear side. A pair of holding parts 58 protrude from the filter cushion 57, and the tips of the pair of holding parts 58 are formed into a C-shape. A pair of branch pipes are fitted into the openings of the pair of holding parts 58 so that the main pipe of the branch joint 61 faces upward and the pair of branch pipes of the branch joint 61 face in the front-rear direction. The connection pipe 63 of the fuel injection valve 62 faces diagonally upward.

[0024] An upstream end of an upstream filter pipe 71 is connected to the discharge pipe 52 of the fuel pump 51, and a downstream end of the upstream filter pipe 71 is connected to the inlet pipe 55 of the fuel filter 54. An upstream end of a downstream filter pipe 72 is connected to the outlet pipe 56 of the fuel filter 54, and a downstream end of the downstream filter pipe 72 is connected to the main pipe of the branch joint 61. An upstream end of a return pipe 73 is connected to the forward branch pipe of the branch joint 61, and a downstream end of the return pipe 73 is connected to the suction pipe 53 of the fuel pump 51. An upstream end of a feed pipe 74 is connected to the backward branch pipe of the branch joint 61, and a downstream end of the feed pipe 74 is connected to the connecting pipe 63 of the fuel injection valve 62.

[0025] In the fuel supply device 50, fuel is pumped up from the fuel tank 41 by the fuel pump 51, and the fuel is discharged from the fuel pump 51 to the upstream filter pipe 71. The fuel is sent from the upstream filter pipe 71 to the fuel filter 54, where foreign matter in the fuel is removed, and the fuel is sent to the downstream filter pipe 72. When the fuel is sent from the downstream filter pipe 72 to the branch joint 61, the flow of the fuel is branched at the branch joint 61 into a feed pipe 74 and a return pipe 73. Fuel is supplied from the feed pipe 74 to the fuel injection valve 62, where fuel injection is performed, and surplus fuel is returned from the return pipe 73 to the fuel pump 51.

[0026] As described above, when blended fuel or alcohol fuel is used, vapor is likely to be generated in the fuel filter 54. For this reason, the fuel filter 54 is tilted so that the inlet pipe 55 of the fuel filter 54 is higher than the outlet pipe 56. That is, the axis L2 of the fuel filter 54 is higher toward the front with respect to the horizontal line L1 of the saddle riding type vehicle 1. Even if vapor is generated in the fuel filter 54, the inclination of the fuel filter 54 makes it easy for the vapor to move toward the upstream filter pipe 71. The vapor is less likely to move toward the downstream filter pipe 72, and the movement of the vapor toward the fuel injection valve 62 downstream of the fuel filter 54 is suppressed.

[0027] The downstream filter pipe 72 extends upward from the outlet pipe 56 of the fuel filter 54, and then extends downward toward the main pipe of the branch joint 61. The downstream filter pipe 72 is curved in an inverted U shape in a side view, and the middle top of the downstream filter pipe 72 is positioned higher than the upstream and downstream ends. Even if vapor generated in the fuel filter 54 enters the downstream filter pipe 72, the buoyancy of the vapor makes it easy for the vapor to move to the top side (upper side) of the downstream filter pipe 72. The vapor has difficulty moving to the branch joint 61 below the top of the downstream filter pipe 72, and the movement of the vapor toward the fuel injection valve 62 is suppressed.

[0028] The branch joint 61 is installed in an inverted T shape facing upward in the main pipe, but is tilted so that the forward branch pipe of the branch joint 61 is higher than the rearward branch pipe. In other words, the axis L3, which is the center line of the pair of branch pipes of the branch joint 61, rises toward the front with respect to the horizontal line L1 of the saddle riding type vehicle 1. Even if vapor generated in the fuel filter 54 moves toward the branch joint 61, the inclination of the branch joint 61 makes it easier for the vapor to move toward the return pipe 73. The vapor is less likely to move toward the feed pipe 74, so the movement of the vapor toward the fuel injection valve 62 is suppressed.

[0029] The branch joint 61 is located forward of the fuel pump 51, and the return pipe 73 extends upward from a branch pipe in front of the branch joint 61 and then extends rearward toward the fuel pump 51. The return pipe 73 is curved in a horizontal U-shape when viewed from the side, and the downstream end of the return pipe 73 is positioned higher than the upstream end of the return pipe 73. In addition, the portion of the return pipe 73 that extends rearward is positioned higher than the feed pipe 74. Even if vapor moves toward the branch joint 61, the buoyancy of the vapor makes it easy for the vapor to move toward the return pipe 73. It is difficult for the vapor to move toward the feed pipe 74, and the movement of the vapor toward the fuel injection valve 62 is suppressed.

[0030] The fuel injection valve 62 is positioned lower than the branch joint 61, and the downstream side of the feed pipe 74 extends upward and then downward toward the fuel injection valve 62. Approximately half of the downstream side of the feed pipe 74 is curved into an inverted U shape in front view, and the middle top of the feed pipe 74 is positioned higher than the upstream and downstream ends. Even if vapor enters the feed pipe 74, the buoyancy of the vapor makes it easy for the vapor to move to the top side (upper side) of the feed pipe 74. Vapor is less likely to reach the fuel injection valve 62 below the top of the feed pipe 74, so malfunction of the fuel injection valve 62 due to vapor lock is suppressed.

[0031] In top view, the downstream filter pipe 72 passes between the return pipe 73 and the feed pipe 74. More specifically, the upstream end of the downstream filter pipe 72 is located inside the feed pipe 74 in the vehicle width direction, and the top of the downstream filter pipe 72 is located outside the return pipe 73 in the vehicle width direction. Swing of the downstream filter pipe 72 is suppressed by being sandwiched between the return pipe 73 and the feed pipe 74. As described above, the branch joint 61 is held by the fuel filter 54. The downstream filter pipe 72, the return pipe 73, and the feed pipe 74 are compactly arranged, and the fuel filter 54 and the branch joint 61 are compactly arranged, thereby suppressing an increase in the size of the vehicle.

[0032] As described above, according to the fuel supply device 50 of this embodiment, even if vapor generated in the fuel filter 54 moves toward the branch joint 61, the inclination of the branch joint 61 makes it easier for the vapor to move from the front branch pipe toward the return pipe 73. It becomes more difficult for vapor to move from the rear branch pipe toward the feed pipe 74, and the movement of vapor through the feed pipe 74 to the fuel injection valve 62 is suppressed. Malfunctioning of the fuel injection valve 62 due to vapor lock is suppressed, and fuel is appropriately injected from the fuel injection valve 62 into the intake passage, making it possible to prevent engine stalls.

[0033] In this embodiment, the pair of branch pipes of the branch joint are oriented in the front-rear direction, but the orientation of the pair of branch pipes is not particularly limited as long as one branch pipe on the return pipe side is higher than the other branch pipe on the feed pipe side. For example, the pair of branch pipes may be oriented in the left-right direction.

[0034] In this embodiment, the axis of the fuel filter and the axis of the pair of branch pipes of the branch joint appear to be parallel, but the axis of the fuel filter and the axis of the pair of branch pipes may be non-parallel. The inclination of the axis of the pair of branch pipes may be greater than the axis of the fuel filter, or the inclination of the axis of the pair of branch pipes may be smaller than the axis of the fuel filter. The axis of the fuel filter may also be horizontal.

[0035] In addition, in this embodiment, the downstream filter pipe, the return pipe, and the feed pipe are curved in a U-shape, but the bent shapes of the downstream filter pipe, the return pipe, and the feed pipe are not particularly limited.

[0036] The fuel supply device of the present embodiment may be used in other types of saddle-ride vehicles, not limited to the above-mentioned saddle-ride vehicles. Note that a saddle-ride vehicle is not limited to vehicles in general in which the rider sits astride the seat, but also includes scooter-type vehicles in which the rider does not sit astride the seat.

[0037] As described above, the first aspect is a fuel supply device (50) that supplies fuel from a fuel tank (41) to an intake passage of an engine (25), and includes a fuel pump (51) that sends fuel from the fuel tank toward the fuel passage, a fuel filter (54) located downstream of the fuel pump in the fuel passage, a branch joint (61) located downstream of the fuel filter in the fuel passage, and a fuel injection valve (62) that injects fuel into the intake passage at the downstream end of the fuel passage. The branch joint is provided with a pair of branch pipes, one of which is connected to a return pipe (73) that returns fuel to the fuel pump, and the other is connected to a feed pipe (74) that introduces fuel to the fuel injection valve, and one of the branch pipes is higher than the other. With this configuration, even if vapor generated in the fuel filter moves toward the branch joint, the vapor easily moves from one of the branch pipes to the return pipe. The vapor is less likely to move from the other branch pipe to the feed pipe, and the movement of the vapor through the feed pipe to the fuel injection valve is suppressed. Malfunctioning of the fuel injection valve due to vapor lock is suppressed, and fuel is appropriately injected from the fuel injection valve into the intake passage, thereby preventing the occurrence of engine stall.

[0038] In the second aspect, in the first aspect, the branch joint is located forward of the fuel pump, one branch pipe faces forward, the other branch pipe faces rearward, and the return pipe extends upward from one branch pipe and then rearward toward the fuel pump. With this configuration, the return pipe facilitates the movement of vapor from one branch pipe to the return pipe side, and suppresses the movement of vapor from the other branch pipe to the feed pipe side. Also, the degree of freedom in piping of the return pipe is improved.

[0039] In the third embodiment, in the second embodiment, the portion of the return pipe that extends rearward is located above the feed pipe, which further suppresses the movement of vapor toward the feed pipe.

[0040] In a fourth aspect, in any one of the first to third aspects, the fuel injection valve is located lower than the branch joint, and the downstream side of the feed pipe extends upward and then downward toward the fuel injection valve. With this configuration, vapor is less likely to reach the fuel injection valve, and malfunction of the fuel injection valve due to vapor lock is suppressed.

[0041] In the fifth aspect, in any one of the first to fourth aspects, a filter pipe (downstream filter pipe 72) extending from a fuel filter is connected to the main pipe of the branch joint, and the filter pipe extends upward from the fuel filter and then downward toward the main pipe. With this configuration, even if vapor is generated in the fuel filter, the vapor is less likely to move to the branch joint.

[0042] In the sixth aspect, in the fifth aspect, the branch joint is located outside the fuel filter in the vehicle width direction, and the filter pipe passes between the return pipe and the feed pipe in a top view. With this configuration, the filter pipe is sandwiched between the return pipe and the feed pipe, and vibration of the filter pipe is suppressed. In addition, the multiple pipes are compactly arranged, and an increase in the size of the vehicle can be suppressed.

[0043] A seventh aspect is any one of the first to sixth aspects, in which the branch joint is held by the fuel filter. With this configuration, the fuel filter and the branch joint are compactly arranged, and an increase in size of the vehicle can be suppressed.

[0044] Although the present embodiment has been described, other embodiments may be made by combining the above-described embodiments and modifications in whole or in part.

[0045] In addition, the technology of the present invention is not limited to the above examples, and may be modified, substituted, or altered in various ways without departing from the spirit of the technical idea. Furthermore, if the technical idea can be realized in a different way due to the progress of technology or a different technology derived therefrom, the invention may be implemented using that method. Therefore, the claims cover all embodiments that may be included within the scope of the technical idea. [Explanation of symbols]

[0046] 25: Engine 41: Fuel tank 50:Fuel supply device 51: Fuel pump 54: Fuel filter 61: Branch joint 62: Fuel injection valve 72: Downstream filter piping (filter piping) 73: Return pipe 74: Feed pipe

Claims

1. A fuel supply device that supplies fuel from a fuel tank to an intake passage of an engine, a fuel pump that pumps fuel from within the fuel tank toward a fuel passage; a fuel filter located downstream of the fuel pump in the fuel passage; a branch joint located downstream of the fuel passage from the fuel filter; a fuel injection valve at a downstream end of the fuel passage for injecting fuel into the intake passage, a pair of branch pipes are provided at the branch joint, one of the branch pipes is connected to a return pipe for returning fuel to the fuel pump, and the other branch pipe is connected to a feed pipe for introducing fuel to the fuel injection valve; 13. A fuel supply system, comprising: a first branch pipe and a second branch pipe, the first branch pipe being higher than the second branch pipe.

2. The branch joint is located forward of the fuel pump, The one branch is directed forward and the other branch is directed backward; 2. The fuel supply system according to claim 1, wherein the return pipe extends upward from the one branch pipe and then extends rearward toward the fuel pump.

3. 3. The fuel supply device according to claim 2, wherein a rearward extending portion of the return pipe is located above the feed pipe.

4. The fuel injection valve is located lower than the branch joint, 3. The fuel supply device according to claim 1, wherein a downstream side of the feed pipe extends upward and then extends downward toward the fuel injection valve.

5. a filter pipe extending from the fuel filter is connected to a main pipe of the branch joint; 3. The fuel supply device according to claim 1, wherein the filter pipe extends upward from the fuel filter and then extends downward toward the main pipe.

6. the branch joint is located outboard of the fuel filter in the vehicle width direction, 6. The fuel supply device according to claim 5, wherein the filter pipe passes between the return pipe and the feed pipe in a top view.

7. 3. The fuel supply device according to claim 1, wherein the branch joint is held by the fuel filter.

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