JP2008101588A - Fuel supply system of outboard motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply system of an outboard motor reducing the size of the outboard motor by surely preventing fuel leakage and by eliminating a vapor separator in the outboard motor. <P>SOLUTION: In the fuel supply system 23 of the outboard motor for connecting fuel piping in the outboard motor and a fuel tank 40 disposed outside the outboard motor through fuel hoses 44, 45, a fuel supply connector 54 and a fuel return connector 55 on an outboard motor side are provided side by side on the front surface of an engine cover covering an engine of the outboard motor, a fuel supply connector 52 and a fuel return connector 53 on a tank side are provided side by side on the upper surface of the fuel tank 40, the fuel supply connectors 52, 54 and the fuel return connectors 53, 55 are connected to each other through the fuel hoses 44, 50, a tank fuel supply hose 56, a tank fuel return hose 57 and a filter case 58 are installed in the fuel tank 40 and the tank fuel hoses 56, 57 are connected to the filter case 58. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel supply device for an outboard motor.

  Conventionally, in a fuel supply device for a fuel injection engine used in an outboard motor, for example, fuel in a fuel tank disposed outside the outboard motor is guided to a vapor separator in the outboard motor by a low-pressure fuel pump. Then, after being pumped and filtered by a high-pressure fuel pump by a high-pressure fuel pump, it is sent to an intake port by a fuel injector via a delivery pipe, and excess fuel from the downstream side of the delivery pipe is sent to the fuel injector. After being sent to the pressure regulator and the fuel pressure was lowered, it was returned to the vapor separator (see, for example, Patent Document 1).

  By the way, the vapor separator cannot fully function unless it has a certain capacity. Therefore, the vapor separator is necessarily increased in size and requires a lot of space in the engine cover of the outboard motor. Further, since the fuel cannot be sufficiently supplied to the delivery pipe with only the low-pressure fuel pump installed in the outboard motor, the engine cannot be started until the delivery pipe is filled with fuel.

  Further, since the inside of the engine cover becomes a high temperature after the operation of the engine is stopped, vapor is likely to be generated when a vapor separator for storing fuel is arranged in the engine cover.

In view of this, a device has been devised in which the vapor separator in the outboard motor is abolished and excess fuel is returned to the fuel tank outside the outboard motor. As such an outboard motor fuel pipe structure, for example, there is a double pipe structure with a hose for fuel supply on the outside and a hose for fuel return on the inside, and a single hose in appearance. . And by this structure, the ease of insertion of fuel piping and the improvement of external appearance are aimed at (for example, refer to patent documents 2).
Japanese Patent Application No. 10-182619 JP 2002-364482 A

  However, the double-pipe fuel pipe is complicated to assemble, and if a priming pump is provided on the way, the number of connecting parts increases. Moreover, even if the connecting part of the fuel return hose is disconnected inside, it is difficult to notice. Since the fuel itself flows into the supply hose and is supplied to the engine again, there is no problem, but there is a risk that fuel containing vapor will be supplied.

  Furthermore, when the outboard motor is not used for a long time, it is necessary to extract the fuel from the fuel pipe in order to prevent deterioration and deterioration of the fuel. However, because of the structure described above, it is difficult to extract the fuel without removing the fuel pipe. is there. Furthermore, it is difficult to remove the fuel from the fuel pipe on the engine side.

  Further, because of the double pipe structure, the contact area of the fuel on the supply side with the fuel return hose increases, the flow resistance increases, and the load on the fuel pump also increases.

  On the other hand, in order to solve the problems of the double pipe structure described above, it is effective and simple in structure if two hose for fuel supply and hose for fuel return are connected. There is a risk that securing a scaffold during movement on the ship may be difficult, or that an installation error of the fuel pipe may occur.

  The present invention has been made in consideration of the above-described circumstances, and is an outboard motor that can prevent fuel leakage and can reduce the size of the outboard motor by making it possible to eliminate the vapor separator in the outboard motor. An object is to provide a fuel supply device.

  In order to solve the above-described problem, a fuel supply device for an outboard motor according to the present invention includes a fuel pump, a fuel injector, and a pressure regulator connected to the outboard motor. A fuel supply device for an outboard motor comprising a pipe and connecting the fuel pipe and a fuel tank disposed outside the outboard motor with a fuel hose. The engine-side fuel supply connector and the outboard motor-side fuel return connector are arranged side by side, and the tank-side fuel supply connector and the tank-side fuel return connector are arranged side by side on the upper surface of the fuel tank. While the connectors are connected to each other with the fuel hose, the fuel supply hoist in the tank connected to the fuel supply connector on the tank side in the fuel tank. Scan and disposed a fuel return hose and the filter casing in the tank connected to the tank-side fuel return connector, these tank fuel hose which are connected to the filter case.

  In order to solve the above-described problem, as described in claim 2, the inside of the filter case is divided into two spaces by a filter, the tank fuel supply hose is provided in one space, and the other space is provided. The fuel return hose in the tank is connected to each other, a fuel intake port for taking the fuel in the fuel tank into the lower part of the filter case in the other space, and the filter in the upper part of the filter case in the other space. A vapor outlet for discharging the vapor in the case to the outside of the filter case is provided.

  According to the fuel supply device for an outboard motor according to the present invention, it is not necessary to arrange a large vapor separator in the engine cover, so that the outboard motor can be made compact. Further, since the fuel hose disposed outside the outboard motor also has a negative pressure, there is no risk of fuel leaking to the outside even if the fuel hose is damaged.

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

  FIG. 1 is a right side view of an outboard motor to which the present invention is applied. As shown in FIG. 1, the outboard motor 1 includes an engine holder 2 that also serves as an oil pan, and an engine 3 is installed above the engine holder 2. A bracket 4 is attached to the engine holder 2, and the outboard motor 1 is attached to the transom 5 a of the hull 5 through the bracket 4.

  FIG. 2 is an enlarged side view of the engine 3. FIG. 3 is a plan view of the engine 3, and a part thereof is shown in a sectional view. FIG. 4 is a front view of the outboard motor 1. As shown in FIGS. 1 to 4, the engine 3 mounted on the outboard motor 1 is a water-cooled four-cycle two-cylinder engine having a plurality of cylinders (multi-cylinder), for example, a cylinder head 6, a cylinder block 7. And a crankcase 8 or the like. Further, in this engine 3, the exhaust port 9a and the intake port 9b are arranged on the same side of the engine 3, in the present embodiment, on the starboard side, in the order of exhaust from the first cylinder, intake from the top, intake from the second cylinder, and exhaust from the top. The The engine 3 is covered with an engine cover 10, and a front panel 11 is provided on the front surface of the engine cover 10.

  A cylinder block 7 is disposed at the foremost portion of the engine 3, behind the crankcase 8 disposed on the right side in FIGS. 1 and 2 (left side). A cylinder head 6 is disposed behind the cylinder block 7. Further, a head cover 12 is disposed behind the cylinder head 6. A crankshaft 13 is disposed substantially vertically in the joint between the crankcase 8 and the cylinder block 7.

  As shown in FIG. 1, a drive shaft housing 14 is installed below the engine holder 2. Further, the upper end portion of the drive shaft 15 is, for example, spline fitted to the lower end portion of the crankshaft 13 and extends downward in the drive shaft housing 14, and a bevel gear 17 in a gear case 16 provided at the lower portion of the drive shaft housing 14. And the propeller 19 is driven via the propeller shaft 18. Further, a flywheel / magnet device 20 for power generation and a rope / recoil type manual engine starter 21 are provided at the upper end of the crankshaft 13.

  As shown in FIGS. 2 and 3, an electrical component (not shown), an intake device 22, a fuel supply device 23, and the like are disposed around the engine 3. The intake device 22 mainly includes a silencer 24, a throttle body 25, a surge tank 26, and an intake manifold 28 that extends from the surge tank 26 to each cylinder, that is, includes two intake branches 27. Side, in the present embodiment, the engine 3 is arranged from the right side to the front side. Further, the electrical components are collectively arranged on the opposite side of the intake device 22, for example.

  The throttle body 25 constituting the intake device 22 is disposed, for example, in front of the crankcase 8, and a silencer 24 and a surge tank 26 are arranged in parallel on the upstream side and the downstream side of the throttle body 25, respectively. Further, two intake branches 27 are arranged in the vertical direction on the side of the cylinder block 7 so as to communicate the intake ports 9b formed in the cylinder head 6 with the inside of the surge tank 26.

  On the other hand, the fuel supply device 23 has fuel system parts such as a filter and a pump. Specifically, the fuel filters 29 and 30 and the fuel pumps 31 and 32, the pressure regulator 33, the delivery pipe 34, and the fuel injector ( The fuel injection valve) 35 and the like are connected to each other by low-pressure and high-pressure fuel hoses 36 to 39 to constitute fuel piping.

  FIG. 5 is a cross-sectional view taken along line VV in FIG. FIG. 6 is a block diagram of the fuel supply device 23 in the outboard motor 1, and FIG. 7 is a block diagram of the fuel supply device 23 in the outside of the outboard motor 1. As shown in FIGS. 2 to 7, the outboard motor 1 shown in the present embodiment has a fuel tank 40 disposed outside the outboard motor 1, specifically, in the hull 5. It is either fixed or movable (portable). The fuel tank 40 is provided with a fuel filler port 41 and is closed by a detachable tank cap 42. Further, the tank cap 42 is provided with an air vent hole 43 for releasing vapor generated in the fuel tank 40 to the outside of the tank.

  An external fuel supply hose 44 extends from the fuel tank 40 toward the front panel 11 disposed in front of the outboard motor 1, for example. A priming pump 45 is provided in the middle of the external fuel supply hose 44.

  On the other hand, in the outboard motor 1, an internal fuel supply hose 46 extends from the front panel 11 to the rear through the port side of the engine 3, for example, to the low pressure fuel filter 29 disposed on the left side of the cylinder head 6. Connected. The head cover 12 located at the rearmost part of the engine 3 is provided with a mechanical low-pressure fuel pump 31 as a fuel supply pump driven by a camshaft 47 that constitutes a valve operating device of the engine 3, The low pressure fuel pump 31 and the low pressure fuel filter 29 are connected by a low pressure fuel hose 36.

  A high pressure fuel pump 32 as a fuel pressurizing pump is arranged in a space between the cylinder block 7 constituting the engine 3 and the intake branch 27 constituting the intake device 22 arranged on the side surface of the cylinder block 7. . The high-pressure fuel pump 32 is disposed between the upper and lower intake branches 27 in a side view so as to overlap the intake branch 27 in a top view and substantially parallel to the axis of the intake branch 27 and is fixed to, for example, the intake branch 27 side. The fuel from the low pressure fuel pump 31 is guided to the high pressure fuel pump 32 via another low pressure fuel hose 37. The cross-sectional shape of the intake branch 27 is formed in a recessed shape 48 along the outer shape of the high-pressure fuel pump 32 as shown in FIG.

  Among the intake branches 27 arranged in parallel in the vertical direction, a high-pressure fuel filter 30 is disposed above the intake branch 27 disposed at the top, and the high-pressure fuel filter 30 is pressurized to a predetermined pressure by the high-pressure fuel pump 32. The fuel that has been discharged is pumped through the high-pressure fuel hose 38.

  Each intake port 9b formed in the cylinder head 6 is provided with a fuel injector 35 from the outside. These fuel injectors 35 are connected to a single delivery pipe 34 extending in the vertical direction, and upstream of the delivery pipe 34. A high-pressure fuel filter 30 is connected to the upper end, which is an end, via another high-pressure fuel hose 39, and high-pressure fuel is guided to the delivery pipe 34. The fuel injector 35 injects high-pressure fuel into the intake port 9.

  A pressure regulator 33 that keeps the fuel pressure pressurized by the fuel injector 35 constant is disposed at the lower end, which is the downstream end of the delivery pipe 34. That is, the pressure regulator 33 lowers the fuel pressure by opening a valve (not shown) inside the delivery pipe 34 when the fuel pressure in the delivery pipe 34 exceeds a predetermined pressure to release the fuel to the outside. Is connected to an internal fuel return hose 49 and extends toward the front panel 11. An external fuel return hose 50 extends from the front panel 11 toward the fuel tank 40 outside the outboard motor 1. A control device 51 (ECU) that controls each fuel supply device 23 is fixed on a cover 21a of the engine 3 starting device 21 disposed above the cylinder head 6, for example.

  As shown in FIG. 7, an external fuel supply hose 44 and an external fuel return hose 50 that connect the fuel supply device 23 in the outboard motor 1 and the fuel tank 40 in the hull 5 are connected to the outboard motor 1 and the fuel tank 40, respectively. It is detachable. In this embodiment, for example, a tank-side fuel supply connector 52 and a tank-side fuel return connector 53 are provided on the upper surface of the fuel tank 40, and the outboard motor-side fuel supply connector 54 and the outside of the front panel 11 of the outboard motor 1 are provided. An outboard motor side fuel return connector 55 is provided.

  An upstream end of the internal fuel supply hose 46 is connected to the outboard motor side fuel supply connector 54 inside the front panel 11, and the internal fuel is connected to the outboard motor side fuel return connector 55 inside the front panel 11. The downstream end of the return hose 49 is connected. The tank-side fuel supply connector 52 and the tank-side fuel return connector 53 are connected to an in-tank fuel supply hose 56 and an in-tank fuel return hose 57 inside the fuel tank 40, respectively. A filter case 58 is attached to the downstream end of the tank fuel return hose 57.

  The inside of the filter case 58 is divided into two spaces by a filter 58a. The tank fuel supply hose 56 is connected to one space to become the downstream space 58b, while the tank internal fuel return hose 57 is connected to the other space to become the upstream space 58c. Further, a fuel intake port 58d for taking in the fuel in the fuel tank 40 is provided below the filter case 58 in the upstream space 58c, which is the other space. Similarly, a vapor discharge port 58e for discharging the vapor in the filter case 58 to the outside of the filter case 58 is provided above the filter case 58 in the upstream space 58c.

  On the other hand, although the external fuel supply hose 44 and the external fuel return hose 50 are not shown in detail, their outer cylinders are of different colors, for example, red and blue, and both ends of these hoses are connected to the tank side. And hose side fuel supply connectors 59 and 60 and hose side fuel return connectors 61 and 62 that can be connected to the outboard motor side fuel supply connectors 52 and 54 and the fuel return connectors 53 and 55, respectively.

  Tank-side fuel supply connector 52, tank-side fuel return connector 53, outboard motor-side fuel supply connector 54, and outboard motor-side fuel return connector 55 provided on the upper surface of fuel tank 40 and front panel 11 of outboard motor 1, respectively. Are integrated (for example, the tank-side fuel supply connector 52 and the tank-side fuel return connector 53 are on the upper surface of the fuel tank 40) or juxtaposed at adjacent positions (for example, the outboard motor-side fuel supply connector 54 and the outboard motor-side fuel return). The connector 55 is arranged side by side on the left side of the front surface of the front panel 11. The connector may be integrated on the outboard motor 1 side, the fuel tank 40 side may be provided side by side, or both may be integrated and both may be provided side by side.

  The fuel supply and fuel return connectors 52 to 55 and 59 to 62 that are integrated or juxtaposed are, for example, one having a convex shape and the other having a concave shape, and the connectors 52 to 55 and 59 to 62 are For example, a backflow prevention valve 63 such as a ball joint is provided. Further, each of the connectors 52 to 55 and 59 to 62 is provided with a detachable lock device 64. Among the connectors 52 to 55 provided on the upper surface of the fuel tank 40 and the front panel 11 of the outboard motor 1, at least the outboard motor side fuel return connector 55 has a hose side fuel return connector 62 of the external fuel return hose 50. Connector connection detecting means 65 for detecting the connection is provided, and this connector connection detecting means 65 is connected to the ECU 51, for example. The ECU 51 performs control so that the engine 3 cannot be operated unless it is detected that the hose side fuel return connector 62 of the external fuel return hose 50 is connected to the outboard motor side fuel return connector 55.

  On the other hand, the external fuel supply hose 44 and the external fuel return hose 50 are at least partly covered with a protective outer cylinder 66, and each protective outer cylinder 66 is provided with a connecting means 67, and this connecting means. 67, the external fuel supply hose 44 and the external fuel return hose 50 are connected and integrated in a close parallel state. In this embodiment, the protective outer cylinder 66 is provided only at one place, but the protective outer cylinder 66 may cover a plurality of places on the hose.

  Next, the operation of this embodiment will be described.

  The fuel in the fuel tank 40 disposed outside the outboard motor 1 is guided from the fuel intake port 58d of the filter case 58 into the upstream space 58c of the filter case 58, passes through the filter 58a, and is downstream of the filter case 58. After being guided to the side space 58b and filtered through the fuel supply hose 56 in the tank and the external fuel supply hose 44 and the internal fuel supply hose 46, the fuel is filtered by the low-pressure fuel filter 29 and placed in the outboard motor 1. Pumped by the low-pressure fuel pump 31 that has been made. The pumped fuel is then filtered by the high-pressure fuel filter 30 on the way by the high-pressure fuel pump 32, then pumped to the delivery pipe 34, and injected from the delivery pipe 34 to the intake port 9 b by the fuel injector 35.

  When the fuel pressure in the delivery pipe 34 rises above a predetermined pressure, a valve (not shown) inside the pressure regulator 33 disposed at the downstream end of the delivery pipe 34 is opened to reduce the fuel pressure so that the fuel is released to the outside. Configured. The fuel that has escaped to the outside, so-called surplus fuel, is returned to the upstream space 58 c in the filter case 58 via the internal fuel return hose 49 and the external fuel return hose 50, via the in-tank fuel return hose 57.

  An outboard connecting the engine cover 10 covering the engine 3 of the outboard motor 1 with an external fuel supply hose 44 for guiding fuel into the engine cover 10 and an external fuel return hose 50 for guiding fuel out of the engine cover 10. An outboard motor side fuel supply connector 54 and an outboard motor side fuel return connector 55 are provided, at least the outboard motor side fuel supply connector 54, fuel pumps 31 and 32 (at least one of low pressure and high pressure), a fuel injector 35, Since the pressure regulator 33 and the outboard motor side fuel return connector 55 are connected in series, it is not necessary to dispose a large vapor separator, which is conventionally required, in the engine cover 10. As a result, the outboard motor 1 can be made compact. The pressure regulator 33 may be arranged by branching the high-pressure fuel hoses 38 and 39 from the middle.

  Further, since the surplus fuel is returned to the fuel tank 40 via the internal fuel return hose 49 and the external fuel return hose 50, the fuel tank 40 can be used as a conventional vapor separator. As a result, no additional parts are required to achieve the same purpose, and the cost can be reduced. Furthermore, since the vapor can be treated not in the high temperature portion in the engine cover 10 but in the relatively low temperature portion in the fuel tank 40, the amount of vapor generated is reduced.

  Further, a filter case 58 is attached to the upstream ends of the in-tank fuel supply hose 56 and the in-tank fuel return hose 57 disposed inside the fuel tank 40, and the inside of the filter case 58 is divided into two spaces by a filter 58a. The tank fuel supply hose 56 is connected to one space (downstream space 58b), the tank fuel return hose 57 is connected to the other space (upstream space 58c), and the other space (upstream side). A fuel intake port 58d for taking in the fuel in the fuel tank 40 is provided below the filter case 58 in the space 58c), and a vapor in the filter case 58 is provided above the filter case 58 in the other space (upstream space 58c). By providing the vapor discharge port 58e that discharges to the outside, the fuel supply hose 56 in the tank It is connected to the downstream side of the filter 58a so that fuel can be supplied without mixing dust and air, and the fuel return hose 57 in the tank is connected to the upstream side of the filter 58a, so that the air is separated. Since the returned fuel is immediately sucked by the fuel supply hose 56 in the tank, the internal fuel return hose 50 disposed outside the outboard motor 1 also has a negative pressure during the operation of the engine 3, and the external fuel hoses 44 and 50 should be There is no risk of fuel leaking outside even if damaged. As a result, the conventionally used vapor separator in the outboard motor 1 can be eliminated, and the outboard motor 1 can be made compact.

  By the way, in the case of the engine 3 not provided with the vapor separator, it is necessary to return the fuel to the fuel tank 40 disposed outside the outboard motor 1 in order to circulate the surplus fuel, but the external fuel return hose 50 is temporarily connected. If the engine 3 is started without being connected, or if the external fuel return hose 50 is disconnected while the engine 3 is operating, there will be no excess fuel outlet and problems such as failure of the fuel pumps 31 and 32 and fuel leakage Cause.

  Therefore, the hose side fuel return connector 62 of the external fuel return hose 50 is connected to at least the outboard motor side fuel return connector 55 among the connectors 52 to 55 provided on the upper surface of the fuel tank 40 and the front panel 11 of the outboard motor 1. Connector connection detecting means 65 is provided to detect that the engine 3 is operated, and the engine 3 operates unless it is detected that the hose side fuel return connector 62 of the external fuel return hose 50 is connected to the outboard motor side fuel return connector 55. By controlling so that it cannot do, the trouble mentioned above can be prevented and the reliability of the outboard motor 1 improves.

  In addition, an external fuel supply hose 44 and an external fuel return hose 50 that connect the fuel supply device 23 in the outboard motor 1 and the fuel tank 40 in the hull 5 are connected to the outboard motor 1 and the fuel tank 40 with connectors 52 to 55, respectively. By providing it detachably via 59 to 62, the outboard motor 1 and the fuel tank 40 can be provided with versatility, and the merchantability is improved. Furthermore, if the fuel tank 40 is movable (portable), only the fuel tank 40 can be moved freely, so that a merit in transportation increases.

  Further, each of the connectors 52 to 55 and 59 to 62 is provided with a backflow prevention valve 63 such as a ball joint, and the connectors 52 to 55 and 59 to 62 are provided with a detachable locking device 64. As a result, it is possible to prevent the connectors 52 to 55 and 59 to 62 from being forgotten or dropped out, and to prevent the fuel from flowing out.

  On the other hand, since the external fuel supply hose 44 and the external fuel return hose 50 are arranged in a close parallel state, the hose 44, 50 is prevented from being caught in the ship and the outboard motor 1 can be easily rigged. Further, if the connection is made using the connection means 67 in this state, piping between the outboard motor 1 and the fuel tank 40 becomes easy. Furthermore, by covering at least a part of the outer cylinders of the external fuel supply hose 44 and the external fuel return hose 50 with the protective outer cylinder 66, the hose 44, 50 can be prevented from being damaged.

  Further, if the tank-side fuel supply connector 52, the tank-side fuel return connector 53, the outboard motor-side fuel supply connector 54, and the outboard motor-side fuel return connector 55 are arranged adjacent to each other or integrated, the outboard motor 1 and the fuel The operability of the piping and connector between the tank 40 and the attachment / detachment workability are improved. Further, if the connector connectors 52 to 55 and 59 to 62 for fuel supply and fuel return that are integrated or juxtaposed, for example, one is a convex shape and the other is a concave shape, the two hoses 44 and 50 are connected. Incorrect connection can be prevented. Then, the outer cylinders of the external fuel supply hose 44 and the external fuel return hose 50 are colored differently to facilitate the identification of both the hoses 44 and 50.

  Furthermore, if the priming pump 45 is provided in the middle of the external fuel supply hose 44, for example, even if the efficiency of the low-pressure fuel pump 31 is reduced, the fuel can be reliably sent to the high-pressure fuel pump 32. The improvement can be achieved and the identification of both the hoses 44 and 50 is facilitated.

  Further, the low pressure fuel pump 31 and the high pressure fuel pump 32 which are fuel supply and pressurization means, and the pressure regulator 33 which is a means for returning surplus fuel are provided on the outboard motor side, so that the high pressure portion of the fuel supply device 23 is provided. Can be set only in the engine cover 10, and safety is improved.

  When the outboard motor 1 is not used for a long time, it is necessary to remove the fuel from the fuel hoses 36 to 39 disposed in the engine 3 in order to prevent the deterioration and deterioration of the fuel. If the supply hose 44 is connected to the outboard motor side fuel return connector 55 and the priming pump 45 is operated, the fuel in the fuel hoses 36 to 39 can be easily extracted.

  In the above-described embodiment, the example in which the exhaust port 9a and the intake port 9b are arranged on the same side (starboard side) of the engine 3 is shown. However, for example, as in the case of a DOHC engine, the exhaust port and the intake port are respectively connected to the engine. It may be arranged on a different side.

  Further, in the above-described embodiment, the sectional shape of the intake branch 27 is shown as the recessed shape 48 along the outer shape of the high-pressure fuel pump 32. However, if there is a space, the recessed shape 48 is not necessarily formed in the intake branch 27. It is not necessary to provide a circular cross section.

  Furthermore, in the above-described embodiment, the example in which the low pressure fuel pump 31 for supplying fuel and the high pressure fuel pump 32 for pressurization are provided as fuel pumps. However, as shown in FIG. The high-pressure fuel pump 32 (and the high-pressure fuel filter 30) can be replaced with the high-pressure fuel filter 29) and the system can be simplified. However, considering the startability of the engine 3, it is desirable to provide the low-pressure fuel pump 31.

The right view of the outboard motor which shows one Embodiment of the fuel supply apparatus of the outboard motor which concerns on this invention. The enlarged side view of an engine. The top view of an engine. The front view of an outboard motor. Sectional drawing which follows the VV line | wire of FIG. The block diagram of the fuel supply apparatus in an outboard motor. The block diagram of the fuel supply apparatus outside an outboard motor. The block diagram which shows other embodiment of the fuel supply apparatus in an outboard motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outboard motor 3 Engine 10 Engine cover 23 Fuel supply device 31 Low pressure fuel pump 32 High pressure fuel pump 33 Pressure regulator 35 Fuel injector 40 Fuel tank 44 External fuel supply hose 50 External fuel return hose 52 Tank side fuel supply connector 53 Tank side fuel Return connector 54 Outboard motor side fuel supply connector 55 Outboard motor side fuel return connector 56 In-tank fuel supply hose 57 In-tank fuel return hose 58 Filter case 58a Filter 58b Downstream space (one space)
58c Upstream space (the other space)
58d Fuel inlet 58e Vapor outlet

Claims (2)

A fuel for an outboard motor having a fuel pipe connected to a fuel pump, a fuel injector, and a pressure regulator in the outboard motor and connecting the fuel pipe to a fuel tank disposed outside the outboard motor with a fuel hose. In the supply device, an outboard motor side fuel supply connector and an outboard motor side fuel return connector are juxtaposed on the front surface of an engine cover that covers the engine of the outboard motor, and a tank side fuel supply connector and an upper surface of the fuel tank In-tank fuel supply hose connected to the tank-side fuel supply connector in the fuel tank while tank-side fuel return connectors are juxtaposed and the fuel supply connectors and the fuel return connectors are connected to each other by the fuel hose. And a tank fuel return hose connected to the tank side fuel return connector and a filter case. Set, and the fuel supply system for an outboard motor of these tanks in the fuel hose, characterized in that connected to the filter case. The inside of the filter case is divided into two spaces by a filter, the fuel supply hose in the tank is connected to one space, the fuel return hose in the tank is connected to the other space, and the filter in the other space is connected. A fuel intake port for taking in the fuel in the fuel tank is provided at the lower part of the case, and a vapor discharge port for discharging the vapor in the filter case to the outside of the filter case at the upper part of the filter case in the other space. The fuel supply device for an outboard motor according to claim 1.

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