JP7266461B2 - fuel supply - Google Patents

Description

The present disclosure relates to fuel delivery systems.

A fuel supply device is a device for pressurizing and feeding fuel sucked from the inside of the fuel tank, which is arranged at the bottom inside the fuel tank. Among such fuel supply devices, a filter device having a filter for filtering fuel is disposed at the bottom of the fuel tank. A fuel supply device sucks fuel in a fuel tank through a filter device (for example, Patent Document 1).

International Publication No. WO2017/141628

In such a fuel supply system, for example, when the fuel tank continues to be tilted from the horizontal direction, or when the vehicle turns and lateral acceleration is applied to the fuel tank, the fuel in the fuel tank will be depleted. It may remain biased to one side. If this state continues, the liquid surface and the filter device separate after the fuel in contact with the filter device is sucked, and even if the fuel biased to one side remains in the fuel tank, Regardless, there is a possibility that the suction of fuel will be delayed. In order to solve such a problem, there is a demand for a technique that can suppress the delay of fuel suction even when the fuel in the fuel tank is biased to one side.

According to one aspect of the present disclosure, a fuel supply system is provided. This fuel supply device is a fuel supply device (10, 10a, 10b) arranged at the bottom inside the fuel tank to supply fuel from the fuel tank, and pressurizes the fuel sucked from the fuel tank. a pump (130) having a vapor discharge hole (135) for discharging vaporized fuel; a filter device (110) having a filter for filtering the fuel sucked into the pump; a fuel storage portion (140) provided on the upper side in the direction of gravity and connected to the vapor release hole to store the fuel released from the vapor release port; and a fuel discharge portion (145) for discharging fuel toward the fuel discharge portion (145). If the inflow is less than the defined amount, the inflow is less than the discharge. With such a configuration, for example, when the fuel in the fuel tank is tilted from the horizontal direction, the amount of fuel flowing into the fuel reservoir from the vapor discharge hole is reduced by reducing the amount of fuel sucked by the pump. decreases, the inflow amount becomes smaller than the discharge amount of fuel discharged from the fuel discharge section. That is, the fuel stored in the fuel storage portion is discharged toward the filter device. Therefore, for example, when the fuel in the fuel tank is tilted from the horizontal direction, in addition to the fuel at the position in contact with the filter device, Since it becomes possible to suck the fuel to be drawn, it is possible to suppress the delay in the suction of the fuel.

The embodiment of the present disclosure is not limited to the fuel supply device, and can be applied to various embodiments such as a vehicle equipped with the fuel supply device and a fuel supply method. In addition, the present disclosure is not limited to the above-described forms, and can of course be implemented in various forms without departing from the scope of the present disclosure.

It is an explanatory view showing a schematic structure of a fuel supply device. FIG. 4 is an explanatory diagram for explaining a fuel flow FL; FIG. 2 is a view showing a fuel tank in which a fuel supply device is arranged; FIG. 2 is a view showing a fuel tank in which a fuel supply device is arranged; It is an explanatory view showing a schematic structure of a fuel supply system of a comparative example. It is an explanatory view showing a schematic structure of a fuel supply device of a 2nd embodiment. It is an explanatory view showing a schematic structure of a fuel supply system of a 3rd embodiment. 1 is an explanatory diagram showing a schematic configuration of a fuel pump using an impeller; FIG. FIG. 4 is an enlarged view of a part of the fuel pump;

A. First embodiment:
A fuel supply device 10 according to the first embodiment shown in FIG. 1 is arranged at the inner bottom of a fuel tank installed in a moving body such as a vehicle, and supplies fuel from the fuel tank. The XYZ axes in FIG. 1 have X, Y, and Z axes as three spatial axes orthogonal to each other. The XYZ axes in FIG. 1 correspond to the XYZ axes in the other figures.

The fuel supply device 10 includes a filter device 110 , an intake pipe 120 , a pump 130 and a fuel reservoir 140 . FIG. 1 shows a part of the configuration of the fuel supply device 10, and the configuration not shown includes a valve device, a fuel flow path for supplying fuel to the engine, and the like.

A filter device 110 is located at the bottom inside the fuel tank. Filter device 110 filters fuel drawn into pump 130 . The filter device 110 has a configuration in which two substantially rectangular cloth-like members are welded to each other at their peripheral edges, and a space capable of accommodating a holding member (not shown) is formed inside. The holding member is a skeleton member that holds the swollen state of the cloth-like member.

Suction pipe 120 connects filter device 110 and pump 130 . In this embodiment, the suction pipe 120 is connected to the + side of the filter device 110 in the Z-axis direction and is connected to the - side of the pump 130 in the Y-axis direction. Intake pipe 120 forms a fuel flow path for guiding fuel from filter device 110 to pump 130 .

The pump 130 pressurizes and sends the fuel sucked from the fuel tank through the filter device 110 . Pump 130 sends fuel to a fuel flow path for supplying fuel to the engine via a valve device (not shown) that adjusts the pressure of fuel sent from pump 130 .

FIG. 2 shows the fuel flow FL drawn by the pump 130 . A flow FL represents the flow of fuel contained in the filter device 110 through the suction pipe 120 and into the pump 130 before being directed to the valve device.

Returning to the description of FIG. 1, pump 130 has vapor discharge hole 135 . Vapor release holes 135 release vapor, which is vaporized fuel, along with a small amount of liquid fuel that is part of the fuel drawn by pump 130 . In this embodiment, the vapor emission hole 135 emits vapor toward the minus side in the Y-axis direction. In FIG. 2, the vapor discharge hole 135 is illustrated with a thickness in the Y-axis direction in order to clarify its arrangement position. However, FIG. 2 does not accurately represent the dimensions of the fuel delivery system 10 .

The fuel reservoir 140 is provided on the + side in the Z-axis direction with respect to the filter device 110 . Fuel storage portion 140 is connected to vapor release hole 135 and can store fuel released as vapor from vapor release hole 135 . In this embodiment, the fuel reservoir 140 has a rectangular parallelepiped shape. Since the portion of fuel storage portion 140 that is connected to vapor release hole 135 is open, the fuel is released from vapor release hole 135 toward the inside of fuel storage portion 140 .

Fuel reservoir 140 has fuel outlet 145 and opening 147 . The fuel discharge portion 145 discharges the fuel stored in the fuel storage portion 140 toward the - side in the Z-axis direction. In this embodiment, the fuel discharge portion 145 is a tubular member extending from the − side portion of the fuel storage portion 140 in the Z-axis direction toward the − side in the Z-axis direction. The opening 147 is formed on the positive side in the Z-axis direction, which is the upper end side of the fuel reservoir 140 in the gravitational direction.

When the inflow amount of fuel flowing into fuel storage portion 140 from vapor discharge hole 135 is greater than a predetermined specified amount, the inflow amount is greater than the discharge amount of fuel discharged from fuel discharge portion 145 . Further, when the inflow amount of fuel flowing into the fuel storage portion 140 from the vapor discharge hole 135 is smaller than the above specified amount, the inflow amount is smaller than the discharge amount of fuel discharged from the fuel discharge portion 145 . In the present embodiment, the technical content will be described assuming that the inflow amount is proportional to the flow rate of the fuel in the flow FL described in FIG. The prescribed amount will be described later.

FIG. 3 shows a fuel tank TK in which the fuel supply device 10 is arranged. For example, in the state of FIG. 3, since the fuel tank TK is horizontal, the liquid level of the fuel FU in the fuel tank TK is also horizontal. The positions where the fuel FU exists are hatched. The fuel contained in filter device 110 is sucked into pump 130 via suction pipe 120 as the fuel soaks into the cloth-like member that constitutes filter device 110 . A small amount of liquid fuel, which is part of the fuel sucked by pump 130 , and vapor are discharged from vapor discharge hole 135 toward fuel reservoir 140 .

FIG. 3 shows the flow IN of fuel flowing into fuel reservoir 140 from vapor release hole 135 . In the state of FIG. 3, the filter device 110 is immersed in a sufficient amount of fuel, so the flow rate of the fuel due to the flow FL is sufficiently high. In such a situation, the amount of inflow due to flow IN is greater than the prescribed amount, so the amount of inflow is greater than the amount of fuel discharged from fuel discharge portion 145 . FIG. 3 also shows the flow EX of fuel discharged from the fuel discharge portion 145. As shown in FIG. In the first embodiment, the amount at which the amount of inflow due to flow IN is equal to the amount of discharge due to flow EX is the prescribed amount. In the state of FIG. 3, the inflow amount due to flow IN is larger than the specified amount, so the amount of fuel stored in fuel storage portion 140 increases.

FIG. 4 shows a fuel tank TK in which the fuel supply device 10 is arranged. In the state of FIG. 4, for example, the fuel tank TK is tilted from the horizontal direction. is biased to one side.

In the state of FIG. 4, the liquid fuel outside the filter device 110 is biased toward the negative side in the Y-axis direction, and the filter device 110 does not touch the liquid fuel outside the filter device 110 . As a result, the filter device 110 sucks gas, and the flow rate of the fuel due to the flow FL is small. In such a situation, the amount of inflow due to the flow IN becomes smaller than the specified amount, so that the amount of inflow becomes smaller than the amount of fuel discharged from the fuel discharge portion 145 . In the state of FIG. 4, the inflow amount due to the flow IN is smaller than the discharge amount due to the flow EX, so the amount of fuel stored in the fuel storage section 140 decreases. If the state shown in FIG. 4 continues, after the fuel FU inside the filter device 110 is sucked, the fuel FU biased toward the negative side in the Y-axis direction remains in the fuel tank TK. Therefore, the fuel supply device 10 cannot suck the fuel.

In the fuel supply device 10, as described with reference to FIG. 4, when the filter device 110 is not in contact with the liquid fuel outside the filter device 110, the amount of fuel stored in the fuel reservoir 140 decreases. . As a result, the amount of fuel, including the fuel stored in fuel storage portion 140 , that is equal to or greater than the inflow amount from vapor release hole 135 is supplied to filter device 110 . Therefore, even if the fuel in the fuel tank TK is biased to one side, it is possible to prevent the fuel from being sucked.

FIG. 5 shows a fuel supply device 10p of a comparative example. The fuel supply device 10p has the same configuration as the fuel supply device 10 of the first embodiment, except that it does not include the fuel reservoir 140. As shown in FIG. In the state of FIG. 5, for example, similar to the state of FIG. 4, the fuel tank TK is tilted from the horizontal direction. FU is in a state biased to one side in the fuel tank TK.

If the state shown in FIG. 5 continues, after the fuel FU in the filter device 110 is sucked, the fuel is sucked even though the fuel remains in the fuel tank TK, which is biased toward one side. I can't. Further, since the fuel supply device 10p of the comparative example does not include the fuel reservoir 140, the suction of fuel is likely to be delayed in the state shown in FIG.

According to the embodiment described above, for example, in a state in which the fuel in the fuel tank TK is tilted from the horizontal direction, the amount of fuel sucked by the pump 130 is reduced, so that the fuel flows from the vapor discharge hole 135 into the fuel reservoir 140. When the inflow amount of fuel is reduced, the inflow amount becomes smaller than the discharge amount of fuel discharged from the fuel discharge portion 145 . That is, the amount of fuel stored in fuel storage portion 140 decreases. Therefore, for example, when the fuel in the fuel tank TK is tilted from the horizontal direction, in addition to the fuel in the filter device 110, the Since it becomes possible to suck the supplied fuel, it is possible to suppress the delay in sucking the fuel.

Further, the fuel reservoir 140 has an opening 147 on the upper end side in the direction of gravity. Therefore, when the fuel stored in the fuel storage section 140 is full and the fuel further flows into the fuel storage section 140 from the vapor release hole 135 , the fuel can be discharged from the opening 147 . Therefore, the vapor can continue to be released from the vapor release hole 135 even after the fuel reservoir 140 is full.

B. Second embodiment:
FIG. 6 shows a fuel supply device 10a of the second embodiment. The fuel supply device 10a has the same configuration as the fuel supply device 10 of the first embodiment, except that it has a tubular member 137 and a fuel discharge portion 145a different from the fuel discharge portion 145. As shown in FIG.

Tubular member 137 is a member extending along the Y-axis direction and connects vapor discharge hole 135 and fuel reservoir 140 . The fuel discharge portion 145a is a tubular member branched from the tubular member 137 and extending toward the negative side in the Z-axis direction.

As in the state described with reference to FIG. 3, in the state of FIG. 6, the filter device 110 is immersed in a sufficient amount of fuel, so the flow rate of fuel due to the flow FL is sufficiently large. In such a situation, the inflow amount due to the flow IN increases, so the flow velocity of the flow IN also increases. In the structure of the fuel supply device 10a described above, when the flow velocity of the flow IN is sufficiently high, the flow to the flow EX is difficult to increase, so the inflow amount due to the flow IN becomes larger than the discharge amount due to the flow EX. In the second embodiment, the minimum value of the inflow rate at which the flow velocity of the flow IN increases to such an extent that the inflow rate due to the flow IN is greater than the discharge rate due to the flow EX is the prescribed amount in this embodiment.

Since the specified amount is determined in this way, also in the fuel supply device 10a, when the inflow amount due to the flow IN is larger than the specified amount, the inflow amount is larger than the discharge amount due to the flow EX. Further, when the inflow amount due to the flow IN is smaller than the specified amount, the inflow amount is less than the discharge amount due to the flow EX.

In the state of FIG. 6, the flow velocity of the flow IN is sufficiently high, so that the amount of inflow by the flow IN is larger than the amount of discharge by the flow EX, so the amount of fuel stored in the fuel reservoir 140 increases. Further, in the fuel tank TK in which the fuel supply device 10a is arranged, for example, when the fuel tank TK is tilted from the horizontal direction as shown in FIG. As it falls, the discharge by stream EX increases. Then, when the amount of inflow by the flow IN becomes smaller than the amount of discharge by the flow EX, the amount of fuel stored in the fuel storage section 140 begins to decrease. 110. Therefore, even if the fuel in the fuel tank TK is biased to one side, it is possible to prevent the fuel from being sucked. Therefore, also in the second embodiment, the same effects as in the first embodiment can be obtained.

C. Third embodiment:
FIG. 7 shows a fuel supply device 10b of a third embodiment. The fuel supply device 10b has the same configuration as the fuel supply device 10a of the second embodiment except that it has a tubular member 137b different from the tubular member 137 and a fuel discharge portion 145b different from the fuel discharge portion 145a. .

The tubular member 137b is a member extending along the Y-axis direction and connects the vapor release hole 135 and the fuel reservoir 140, like the tubular member 137 of the second embodiment. The fuel discharge portion 145b is a tubular member branched from a position near the center of the outer peripheral surface of the tubular member 137b and extending toward the negative side in the Z-axis direction. In the tubular member 137b, the cross-sectional area of the portion near the center in the Y-axis direction is smaller than the cross-sectional area of both end portions in the Y-axis direction. The cross-sectional area referred to here is the cross-sectional area when the tubular member 137b is cut along the XZ plane. In other words, the cross-sectional area of the tubular member 137b at the position where the fuel discharge portion 145b is formed is the same as the cross-sectional area of the tubular member 137b at the position where the tubular member 137b and the vapor discharge hole 135 are connected, and the tubular member 137b and the fuel reservoir. It is smaller than the cross-sectional area of the tubular member 137b at the position where the portion 140 is connected. The configuration of the cross-sectional area of the tubular member 137b in this manner is for producing a venturi effect when the fuel flows into the tubular member 137b due to the flow IN.

As in the state described with reference to FIG. 3, in the state of FIG. 7, since the filter device 110 is immersed in a sufficient amount of fuel, the flow rate of the fuel due to the flow FL is sufficiently large. In such a situation, the inflow amount due to the flow IN increases, so the flow velocity of the flow IN also increases. In the structure of the fuel supply device 10b described above, when the flow velocity of the flow IN is sufficiently high, the fuel FU in the fuel tank TK is sucked from the fuel discharge portion 145b by the venturi effect generated inside the tubular member 137b. At this time, the amount of fuel discharged by the flow EX is 0, and the fuel is flowing in from the fuel discharge portion 145b. In the third embodiment, the specified amount is the minimum value of the inflow rate at which the flow rate of the flow IN increases to such an extent that the inflow rate of the flow IN is greater than the discharge rate of the flow EX.

Since the specified amount is determined in this way, also in the fuel supply device 10b, when the inflow amount due to the flow IN is larger than the specified amount, the inflow amount is larger than the discharge amount due to the flow EX. Further, when the inflow amount due to the flow IN is smaller than the specified amount, the inflow amount is less than the discharge amount due to the flow EX.

In the state shown in FIG. 7, the flow velocity of the flow IN is sufficiently high, so that the amount of fuel stored in the fuel storage section 140 increases due to the inflow from the flow IN and the inflow from the fuel discharge section 145b. Further, in the fuel tank TK in which the fuel supply device 10b is arranged, for example, when the fuel tank TK is tilted from the horizontal direction as shown in FIG. As it decreases, the inflow from the fuel outlet 145b also decreases due to the weakening of the venturi effect. When the amount of inflow from the fuel discharge portion 145b continues to decrease, the amount of inflow from the fuel discharge portion 145b becomes 0, and then the amount of fuel discharged from the fuel discharge portion 145b by the flow EX starts to increase. Then, when the amount of inflow by the flow IN becomes smaller than the amount of discharge by the flow EX, the amount of fuel stored in the fuel storage section 140 begins to decrease. 110. Therefore, even if the fuel in the fuel tank TK is biased to one side, it is possible to prevent the fuel from being sucked. Therefore, also in the third embodiment, the same effects as in the first and second embodiments can be obtained.

D. Other embodiments:
In the above-described first embodiment, the technical content will be described on the assumption that the amount of fuel flowing into the fuel reservoir 140 from the vapor discharge hole 135 is proportional to the flow rate of fuel in the fuel flow FL sucked by the pump 130. bottom. However, the amount of fuel that flows into the fuel reservoir from the vapor discharge hole is inversely proportional to the flow rate of fuel that flows out of the fuel reservoir. may have a relationship. The fuel supply device can be configured according to the relationship between the amount of fuel flowing into the fuel reservoir from the vapor release hole and the flow rate of fuel flowing out of the fuel reservoir.
Although the fuel supply device 10a of the second embodiment described above includes the fuel discharge portion 145a, the present disclosure is not limited to this. For example, the fuel supply device 10a of the second embodiment may include the fuel discharge section 145 of the first embodiment in addition to the fuel discharge section 145a. In such a configuration, when the filter device 110 is immersed in a sufficient amount of fuel, the amount of inflow due to the flow IN is greater than the amount of fuel discharged from the fuel discharge portion 145 and the fuel discharge portion 145a. The diameters of the vapor discharge hole 135, the fuel discharge portion 145 and the fuel discharge portion 145a are designed so that Further, the fuel supply device 10b of the third embodiment may also include the fuel discharge section 145 of the first embodiment in addition to the fuel discharge section 145b.

The present disclosure is not limited to the embodiments described above, and can be implemented in various configurations without departing from the scope of the present disclosure. For example, the technical features in the embodiments corresponding to the technical features in the respective modes described in the Summary of the Invention are used to solve some or all of the above problems, or Substitutions and combinations may be made as appropriate to achieve part or all. Also, if the technical features are not described as essential in this specification, they can be deleted as appropriate.

FIG. 8 shows a fuel pump 20 using an impeller. The fuel pump 20 is composed of a motor section 30 and a pump section 40 . The motor section 30 and the pump section 40 are configured integrally.

The motor unit 30 has a stator 32 wound with a coil 31 , a rotor 33 rotatably provided inside the stator 32 , and a shaft 34 that rotates together with the rotor 33 . FIG. 8 shows the axis CA, which is the center of the shaft 34. As shown in FIG.

The pump section 40 has a first pump housing 41 , a second pump housing 42 and an impeller 43 . A space SP formed between the first pump housing 41 and the second pump housing 42 accommodates the impeller 43 . The impeller 43 is made of resin and has a substantially disk shape. Impeller 43 is coupled to shaft 34 and rotates with shaft 34 .

The first pump housing 41 has an inlet 44 . The first pump housing 41 also has a first groove 45 extending in a C-shape in the circumferential direction on the side where the impeller 43 is arranged. The first groove 45 communicates with the suction port 44 .

The second pump housing 42 has a communication port 46 that communicates with the motor section 30 side. The second pump housing 42 has a second groove 47 extending in a C-shape in the circumferential direction on the side where the impeller 43 is arranged. The second groove 47 communicates with the communication port 46 .

When the impeller 43 rotates together with the shaft 34, the fuel in the fuel tank in which the fuel pump 20 is installed is sucked into the space SP from the suction port 44, flows through the first groove 45, and is pressurized by the rotation of the impeller 43. . The pressurized fuel flows through the second groove 47 and is discharged from the communication port 46 to the motor section 30 . The fuel discharged from the pump portion 40 to the motor portion 30 flows through the gap between the stator 32 and the outer shell of the fuel pump 20 and the gap between the stator 32 and the rotor 33, and is discharged from the discharge port 50 to the internal combustion engine. .

In the fuel pump shown in FIG. 1 of Japanese Unexamined Patent Application Publication No. 2017-82116, the impeller deformed such as by warping or swelling due to the impeller being immersed in the fuel sucked into the space SP is installed in the first pump housing or the fuel pump. There is a risk of contact and locking with the second pump housing. Further, when the fuel is sucked, the difference between the pressure applied to the first pump housing side and the pressure applied to the second pump housing side causes the impeller to be pressed against the first pump housing side, increasing the sliding resistance. There is a possibility that An increase in sliding resistance may lead to a drop in flow rate due to wear and vibration due to interference between the impeller and the first pump housing.

On the other hand, in the fuel pump 20 shown in FIG. 8, the space SP has a two-step tapered shape, thereby suppressing interference between the first pump housing 41 or the second pump housing 42 and the impeller 43. ing.

A two-step tapered shape in the space SP will be described with reference to FIG. FIG. 9 shows the fuel pump 20 partially enlarged. FIG. 9 also shows a portion P1 and a portion P2 located at a certain distance from the axis CA among the portions of the second pump housing 42 defining the space SP on the upper side of the paper. FIG. 9 also shows a portion P3 and a portion P4 located at a certain distance from the axis CA among the portions of the first pump housing 41 that define the space SP on the lower side of the paper.

The shortest distances from axis CA to parts P2 and P4 are the same. The shortest distances from axis CA to parts P1 and P3 are the same. The shortest distance from axis CA to portion P1 is twice the shortest distance from axis CA to portion P2. The shortest distance from axis CA to portion P3 is twice the shortest distance from axis CA to portion P4.

From the left side of the drawing to the right side of the drawing, the portions P1 and P3 correspond to the first stage taper shape, and the portions P2 and P4 correspond to the second stage taper shape. The shortest distance L1 from the impeller 43 to the portion P1 is smaller than the shortest distance L2 from the impeller 43 to the portion P2. Also, the shortest distance L3 from the impeller 43 to the portion P3 is smaller than the shortest distance L4 from the impeller 43 to the portion P4. The shortest distance L1 is longer than the shortest distance L3, and the shortest distance L2 is longer than the shortest distance L4. By forming the first pump housing 41 and the second pump housing 42 in this manner, the interference between the first pump housing 41 or the second pump housing 42 and the impeller 43, particularly the second pump housing 42 and the impeller 43 can be suppressed.

The ratio between the shortest distance L1 and the shortest distance L2 and the ratio between the shortest distance L3 and the shortest distance L4 may be the same or different.

DESCRIPTION OF SYMBOLS 10... Fuel supply apparatus, 110... Filter apparatus, 120... Suction pipe, 130... Pump, 135... Vapor release hole, 140... Fuel storage part, 145... Fuel discharge part

Claims (2)

A fuel supply device (10, 10a, 10b) arranged at the inner bottom of a fuel tank and supplying fuel from the fuel tank,
a pump (130) that pressurizes and feeds the fuel sucked from the fuel tank, the pump (130) having a vapor release hole (135) for releasing vaporized fuel;
a filter device (110) having a filter for filtering fuel drawn into the pump;
a fuel storage part (140) provided above the filter device in the gravitational direction and connected to the vapor release hole, and capable of storing the fuel released from the vapor release hole;
a fuel discharge part (145) for discharging the fuel stored in the fuel storage part downward in the direction of gravity,
when the inflow amount of fuel flowing into the fuel reservoir from the vapor discharge hole is larger than a specified amount, the inflow amount is larger than the discharge amount of fuel discharged from the fuel discharge section;
if the inflow is less than the prescribed amount, the inflow is less than the discharge;
the vapor release hole and the fuel reservoir are connected by a tubular member (137b),
The fuel discharge portion is formed on the outer peripheral surface of the tubular member ,
The cross-sectional area of the tubular member at the position where the fuel discharge portion is formed is the cross-sectional area of the tubular member at the position where the tubular member and the vapor discharge hole are connected, and the cross-sectional area between the tubular member and the fuel reservoir. A fuel delivery device that is less than the cross-sectional area of said tubular member in the connected position. The fuel supply device according to claim 1,
A fuel supply device, wherein an opening (147) is formed in the upper end side of the fuel reservoir in the gravitational direction.

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