JP2016121620A - Fuel tank device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly transfer fuel between fuel accommodation parts in the cold season.SOLUTION: A fuel tank 12 has a first fuel accommodation part 12A and a second fuel accommodation part 12B. A first transfer part 14 transfers fuel from the second fuel accommodation part 12B to the first fuel accommodation part 12A via a transfer pipe 16. A circulation pump 20 circulates the fuel accommodated in the second fuel accommodation part 12B through a circulation pipe 18. A heating part 22 heats the fuel flowing in the circulation pipe 18. An ECU 28 controls a flow rate of the circulation pump 20 on the basis of a temperature T of the fuel in the second fuel accommodation part 12B.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel tank device mounted on a vehicle.

A vehicle having an engine as a driving source is equipped with a fuel tank that contains fuel, and the fuel stored in the fuel tank is transferred to the engine by a supply pump or a fuel pump (feed pump) via a fuel filter. The
By the way, when it is cold, the viscosity of fuel, particularly light oil, is high, and in some cases, paraffin is deposited, and the fuel filter is clogged, making it difficult to transfer the fuel by the fuel pump.
Therefore, Patent Document 1 proposes a technique for heating the fuel through the wall of the fuel tank by a heating device, and Patent Document 2 discloses the surplus fuel heated by the engine in the reservoir cup in the fuel tank. There has been proposed a technique for heating a fuel by supplying it to this fuel.

Utility Model Registration No. 3141469 JP2013-163992A

By the way, as a fuel tank device, a first fuel storage section is provided with a fuel tank in which a first fuel storage section and a second fuel storage section are arranged with their lower portions partitioned, so-called vertical fuel tank. There is one that supplies the fuel to the engine. In this case, when the fuel in the first fuel storage unit decreases, the fuel stored in the second fuel storage unit is transferred to the first fuel storage unit via the transfer pipe.
In such a fuel tank device, when paraffin precipitates in the fuel in the fuel tank during cold weather, the fuel is clogged in the suction filter provided in the transfer pipe, and the fuel stored in the second fuel storage portion is transferred to the first fuel storage device. There is a possibility that it cannot be smoothly transferred to the fuel storage portion.
In this case, if a heating means for heating the wall portion of the fuel tank is provided as in Patent Document 1, the heating means becomes large in order to cope with an extremely low temperature environment, and there is a disadvantage that the cost increases.
Moreover, when the fuel in a fuel tank is heated using surplus fuel like patent document 2, since the temperature and flow volume of surplus fuel are limited, there exists a disadvantage in heating a fuel effectively.
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a fuel tank device that is advantageous in smoothly transferring fuel between fuel storage portions during cold weather.

In order to achieve the above object, a first aspect of the present invention is directed to a fuel tank having a first fuel storage portion and a second fuel storage portion, and a suction port disposed in the second fuel storage portion. An outlet is disposed in the first fuel storage unit and a transfer pipe disposed in the first fuel storage unit, and is disposed in the first fuel storage unit from the second fuel storage unit to the first fuel storage unit via the transfer pipe. A first transfer section for transferring fuel, a circulation pipe having a suction port and a discharge port arranged in the second fuel storage section, and a fuel stored in the second fuel storage section for circulation to the circulation pipe And a temperature raising part for raising the temperature of the fuel flowing through the circulation pipe.
According to a second aspect of the present invention, a first reservoir cup having a volume smaller than that of the first fuel storage unit is provided in the first fuel storage unit, and the first transfer unit includes the transfer pipe. In addition to transferring fuel from the second fuel storage unit to the first fuel storage unit via the fuel, the fuel stored in the first fuel storage unit is transferred to the first reservoir cup It is characterized by.
According to a third aspect of the present invention, a second reservoir cup having a volume smaller than that of the second fuel storage portion is provided in the second fuel storage portion, and the suction port and the discharge port of the circulation pipe have the It is located inside the second reservoir cup.
According to a fourth aspect of the present invention, the second fuel storage unit is provided with a level gauge for detecting a fuel level, and the casing for storing the level gauge is provided with the temperature raising unit. Features.
The invention according to claim 5 is characterized in that a control unit for controlling the flow rate of the circulation pump based on the temperature of the fuel stored in the second fuel storage unit is provided.

According to the first aspect of the present invention, the temperature of the fuel in the second fuel storage section flowing through the circulation pipe is raised in the temperature increase section, so that the viscosity of the fuel in the second fuel storage section increases during cold weather. Alternatively, precipitation of paraffin on the fuel is suppressed.
Therefore, it is advantageous in smoothly transferring the fuel from the second fuel storage part to the first fuel storage part via the transfer pipe during cold weather.
According to the invention described in claim 2, it is advantageous to simplify and miniaturize the fuel tank device.
According to the third aspect of the present invention, since a limited amount of fuel in the second reservoir cup is circulated by the circulation pipe, it is advantageous for improving the temperature raising efficiency of the fuel by the temperature raising portion. .
According to the fourth aspect of the present invention, it is not necessary to provide a dedicated attachment member when providing the temperature raising portion, which is advantageous in simplifying and miniaturizing the fuel tank device.
According to the fifth aspect of the present invention, the temperature of the fuel stored in the second fuel storage unit can be appropriately maintained, and the temperature of the fuel is prevented from being excessively increased. This is advantageous for saving power.

It is sectional drawing which shows the structure of the fuel tank for vehicles in 1st Embodiment. It is a block diagram which shows the structure which performs flow control of the circulation pump of the vehicle fuel tank in 2nd Embodiment. It is a block diagram which shows the structure which performs flow control of the circulation pump of the vehicle fuel tank in 3rd Embodiment.

(First embodiment)
Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, the case where the engine supplied with fuel from the fuel tank device is a diesel engine will be described. However, the present invention is naturally applicable even if the engine is a gasoline engine.
As shown in FIG. 1, the fuel tank device 10 includes a fuel tank 12, a first transfer unit 14, a transfer pipe 16, a circulation pipe 18, a circulation pump 20, a temperature raising part 22, and a level gauge 24. And a temperature sensor 26 and an ECU 28.

The fuel tank 12 stores fuel (light oil) and has a first fuel storage portion 12A and a second fuel storage portion 12B, and the lower portions thereof are partitioned and arranged.
That is, the fuel tank 12 includes an elongated bottom wall 1202 extending in the vehicle width direction, a peripheral wall 1204 that stands up from the periphery of the bottom wall 1202, and an upper wall 1206 that connects the upper part of the peripheral wall 1204.
A projecting portion 1208 projecting upward is formed at an intermediate portion in the extending direction of the bottom wall 1202 so as to secure a space for arranging vehicle components such as a drive shaft and a muffler. A portion excluding 1208 is a flat wall portion.
Therefore, the lower portions of the first fuel storage portion 12A and the second fuel storage portion 12B are partitioned by the protruding portion 1208.
A fuel supply port (not shown) is provided at the location of the upper wall 1206 of the first fuel storage portion 12A.
When fuel is supplied from the fuel supply port, the first fuel storage portion 12A is filled with fuel, and then the fuel that exceeds the height of the projecting portion 1208 is supplied from the first fuel storage portion 12A to the second fuel storage portion. The fuel flows into the portion 12B and is stored in the second fuel storage portion 12B.

The first fuel storage portion 12A is provided with a first reservoir cup 30 having a smaller volume than the first fuel storage portion 12A.
The first reservoir cup 30 has a bottom plate portion 3002 and a cylindrical side plate portion 3004 that stands up from the periphery of the bottom plate portion 3002, and the upper side is opened.
The inside of the first reservoir cup 30 and the engine 32 are connected by a delivery pipe 34 that supplies fuel to the engine 32.
The suction port 3402 of the delivery pipe 34 is disposed inside the first reservoir cup 30, and the discharge port 3404 of the delivery pipe 34 is connected to a supply pump (not shown).
A suction filter 36 for removing foreign matter is provided at the suction port 3402 of the delivery pipe 34, and a fuel filter 38 for removing foreign matter is provided at an intermediate portion in the longitudinal direction of the delivery pipe 34.
Accordingly, when the supply pump operates, the fuel in the first reservoir cup 30 is supplied to the engine 32 via the suction filter 36 and the fuel filter 38.

The first transfer part 14 is accommodated in the first fuel accommodating part 12A in addition to transferring the fuel from the second fuel accommodating part 12B to the first fuel accommodating part 12A via the transfer pipe 16. The transferred fuel is transferred to the first reservoir cup 30.
The first transfer unit 14 includes a pressure adjusting unit 40, a first jet pump unit 42, and a second jet pump unit 44.

The pressure adjustment unit 40 is connected to the engine 32 via the fuel recovery pipe 46, and surplus fuel that has not been used in the engine 32 is supplied to the pressure adjustment unit 40 via the fuel recovery pipe 46, thereby surplus. The pressure of the fuel is adjusted to a constant value, and surplus fuel is supplied into the first reservoir cup 30 through the following first and second orifices 4202 and 4204.
The first jet pump unit 42 includes a first orifice 4202 through which surplus fuel flows, and the first fuel through the hole of the bottom plate portion 3002 of the first reservoir cup 30 due to the negative pressure generated in the first orifice 4202. And a first suction part 4204 for sucking fuel in the housing part 12A. The fuel sucked into the first suction part 4204 is supplied from the first jet pump part 42 into the first reservoir cup 30.
The second jet pump unit 44 sucks the fuel in the second fuel storage unit 12B from the second orifice 4402 through which excess fuel flows and the negative pressure generated in the second orifice 4402 from the discharge port 1604 of the transfer pipe 16. And a second suction portion 4404 that performs the above-described operation. The fuel sucked into the second suction part 4404 is supplied from the second jet pump part 44 into the first reservoir cup 30.

The second fuel storage part 12B is provided with a second reservoir cup 52 having a smaller volume than the second fuel storage part 12B.
The second reservoir cup 52 has a bottom plate portion 5202 and a side plate portion 5204 that stands up from the periphery of the bottom plate portion 5202. Thus, the fuel in the second fuel storage portion 12B is configured to be able to flow into the second reservoir cup 52.

The transfer pipe 16 has a suction port 1602 disposed in the second fuel storage portion 12B, that is, in the second reservoir cup 52, and a discharge port 1604 disposed in the first fuel storage portion 12A. The suction port 1602 is provided with a suction filter 17 for removing foreign matter.
The transfer pipe 16 is disposed across the first fuel storage part 12A and the second fuel storage part 12B, and the heat transfer fuel 16 is kept warm by arranging the transfer pipe 16 inside the fuel tank 12. It is illustrated.

The circulation pipe 18 has a suction port 1802 and a discharge port 1804 arranged in the second fuel storage portion 12B.
The circulation pump 20 is constituted by an electric pump, and circulates the fuel stored in the second fuel storage portion 12B through the circulation pipe 18.
The circulation pump 20 is provided at the suction port 1802 of the circulation pipe 18, and a suction filter 48 for removing foreign matter is provided at the suction port of the circulation pump 20.
In the present embodiment, the suction port 1802 and the discharge port 1804 of the circulation pipe 18 are located inside the second reservoir cup 52. That is, the suction filter 48 at the suction port of the circulation pump 20 is located inside the second reservoir cup 52.
Therefore, the fuel is circulated by the circulation pipe 18 by circulating the fuel in the second reservoir cup 52.

The temperature raising unit 22 raises the temperature of the fuel flowing through the circulation pipe 18.
In the present embodiment, an intermediate portion in the longitudinal direction of the circulation pipe 18 is disposed above the upper wall 1206 of the fuel tank 12, and the temperature raising unit 22 is provided in the intermediate portion.
Further, the temperature raising unit 22 is configured by a PTC heater that operates by electric power. In addition, as the temperature raising part 22, an electric heater other than the PTC heater or a heat exchanger is arbitrarily used.

The level gauge 24 is provided in the second fuel storage unit 12B and detects the level of the fuel stored in the second fuel storage unit 12B.
The level gauge 24 includes a gauge main body 2402, a float 2404, and an arm 2406 that is swingably supported by the gauge main body 2402 and has a float 2404 connected to the tip.
The gauge body 2402 detects the liquid level based on the swing angle of the arm 2406 that swings by the float 2404 that moves up and down according to the fuel level.
The gauge body 2402 is housed in a housing 2408, and the upper portion of the housing 2408 is assembled to the upper wall 1206, and the upper portion of the housing 2408 is exposed to the outside of the upper wall 1206.
In this embodiment, an intermediate portion in the longitudinal direction of the circulation pipe 18 is disposed on the upper portion of the housing 2408 exposed to the outside of the upper wall 1206, and this intermediate portion in the longitudinal direction is disposed on the upper portion of the housing 2408. The temperature is raised by the raised temperature raising unit 22.
The level gauge 24 only needs to be able to detect the fuel level, and various conventionally known level gauges 24 can be employed.
The temperature sensor 26 detects the temperature of the fuel stored in the second fuel storage unit 12B.
In the present embodiment, the temperature sensor 26 is located inside the second reservoir cup 52, and the temperature sensor 26 is located in the vicinity of the suction filter 48 provided in the discharge port 1802 of the circulation pipe 18. The temperature of the fuel flowing through the pipe 18 is accurately detected.

The ECU 28 includes a CPU, a ROM that stores and stores a control program, a RAM as an operation area of the control program, an interface unit that interfaces with peripheral circuits and the like.
The ECU 28 executes the control program, whereby the fuel level P of the fuel in the second fuel storage unit 12B detected by the level gauge 24 and the fuel in the second fuel storage unit 12B detected by the temperature sensor 26 are detected. The operation of the circulation pump 20 and the temperature raising unit 22 is controlled according to a determination condition that takes into account the temperature T.
In addition, the ECU constitutes a control unit that controls the flow rate of the circulation pump 20 based on the temperature T of the fuel stored in the second fuel storage unit 12B.

Next, the function and effect will be described.
It is assumed that the vehicle is traveling in a state where the first and second fuel storage portions 12A and 12B are filled with fuel in advance.
At this time, the fuel in the first reservoir cup 30 is supplied to the engine 32 via the delivery pipe 34 by the supply pump.
Further, the first transfer unit 14 is operated by surplus fuel from the engine 32, and the fuel in the first fuel storage unit 12 </ b> A is supplied into the first reservoir cup 30 by the first suction unit 4204.

Here, it is assumed that the ECU 28 turns on the operation of the circulation pump 20 and turns on the temperature raising unit 22 based on the determination condition.
As a result, the temperature of the fuel in the second fuel storage unit 12 </ b> B flowing through the circulation pipe 18 is raised by the temperature raising unit 22.
Accordingly, it is possible to suppress the viscosity of the fuel in the second fuel storage portion 12B from increasing or the precipitation of paraffin in the fuel during cold weather.
Therefore, when the fuel is cold, the fuel is not clogged in the suction filter 17, and the fuel is smoothly transferred from the second fuel storage portion 12B to the first fuel storage portion 12A via the transfer pipe 16. It will be advantageous.
In addition, since the surplus fuel heated by the engine 32 is introduced into the fuel in the first fuel storage portion 12A, the viscosity of the fuel is increased or the precipitation of paraffin in the fuel is suppressed. Therefore, the fuel can be smoothly transferred from the first fuel storage portion 12 </ b> A to the engine 32 via the delivery pipe 34.

Further, the ECU 28 sets the temperature T of the fuel stored in the second fuel storage unit 12B detected by the temperature sensor 26 during the operation of the circulation pump 20 and the temperature raising unit 22 to be equal to or higher than a predetermined upper limit temperature TH. In this case, the flow rate of the circulation pump 20 is controlled so that the temperature T of the fuel in the second fuel storage unit 12B does not rise more than necessary.
In the present embodiment, the ECU 28 stops the circulation pump 20 when the fuel temperature T becomes equal to or higher than a predetermined upper limit temperature TH.
The upper limit temperature TH is sufficiently higher than the temperature at which paraffin precipitates on the fuel stored in the second fuel storage portion 12B.

As described above, according to the present embodiment, the temperature of the fuel in the second fuel storage unit 12 </ b> B flowing through the circulation pipe 18 is raised by the temperature raising unit 22.
Accordingly, it is possible to suppress the viscosity of the fuel in the second fuel storage portion 12B from increasing or the precipitation of paraffin in the fuel during cold weather.
Therefore, when the fuel is cold, the fuel is not clogged in the suction filter 48, and the fuel is smoothly transferred from the second fuel storage portion 12B to the first fuel storage portion 12A via the transfer pipe 16. It will be advantageous.
In addition, since the surplus fuel heated by the engine 32 is introduced into the fuel in the first fuel storage portion 12A, the viscosity of the fuel is increased or the precipitation of paraffin in the fuel is suppressed. Therefore, the fuel can be smoothly transferred from the first fuel storage portion 12 </ b> A to the engine 32 via the delivery pipe 34.

Further, in the present embodiment, the first transfer unit 14 transfers the fuel from the second fuel storage unit 12B to the first fuel storage unit 12A via the transfer pipe 16 in addition to the first fuel storage unit 12A. The fuel stored in the fuel storage section 12A is transferred to the first reservoir cup 30, but separately from the first transfer section 14, the fuel stored in the first fuel storage section 12A is transferred to the first reservoir cup 30A. A second transfer unit that transfers to the reservoir cup 30 may be provided.
However, according to the present embodiment, the first transfer unit 14 transfers the fuel from the second fuel storage unit 12B to the first fuel storage unit 12A, and stores the fuel in the first fuel storage unit 12A. Both the transferred fuel can be transferred to the first reservoir cup 30, which is advantageous in simplifying and downsizing the fuel tank device 10.

In the present embodiment, the second fuel storage portion 12B is provided with the second reservoir cup 52 having a smaller volume than the second fuel storage portion 12B, and the suction port 1802 and the discharge port 1804 of the circulation pipe 18 are provided. Is located inside the second reservoir cup 52, but the second reservoir cup 52 may be omitted.
However, according to the present embodiment, a limited amount of fuel in the second reservoir cup 52 is circulated by the circulation pipe 18, so that the temperature raising efficiency of the temperature raising portion 22 can be improved. Is advantageous.

In the present embodiment, the temperature raising unit 22 is provided in the casing 2408 of the level gauge 24 provided in the second fuel storage unit 12B.
Therefore, it is not necessary to provide a dedicated attachment member when the temperature raising unit 22 is provided, which is advantageous in simplifying and downsizing the fuel tank device 10.

In the present embodiment, the flow rate of the circulation pump 20 is controlled by the ECU 28 (control unit) based on the temperature T of the fuel stored in the second fuel storage unit 12B.
Therefore, the temperature T of the fuel stored in the second fuel storage unit 12B can be appropriately maintained, the temperature of the fuel is prevented from being excessively raised, and the power saving of the circulation pump 20 is achieved. This is advantageous.

(Second Embodiment)
Next, a second embodiment will be described.
FIG. 2 is a block diagram illustrating a configuration for controlling the flow rate of the circulation pump 20 of the vehicle fuel tank according to the second embodiment.
In the following embodiments, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 2, in the second embodiment, a current control unit 56 is provided between the power supply 54 that supplies a predetermined drive current I to the circulation pump 20 and the circulation pump 20.
The current control unit 56 includes first and second relays 5602 and 5604 connected in series between the power supply 54 and the input terminal of the circulation pump 20, and a resistor having a predetermined value connected in parallel to the second relay 5604. 5606.
On / off of the first and second relays 5602 and 5604 is controlled by the ECU 28.
The resistance value of the resistor 5606 is to reduce the actual drive current Ip actually supplied to the circulation pump 20 to, for example, 1 / N (where N> 1) of the predetermined drive current I, that is, Ip = I / N. It is.
Therefore, the ECU 28 controls the driving current Ip stepwise by controlling the on / off of the first and second relays 5602 and 5604 in the following manner.
1) When both the first and second relays 5602 and 5604 are off, the drive current Ip is zero.
2) When the first relay 5602 is on and the second relay 5604 is off, the drive current I is supplied to the circulation pump 20 via the resistor 5606, so the drive current Ip is I / N.
3) When both the first and second relays 5602 and 5604 are on, the drive current Ip = I.
The ECU 28 controls the flow rate of the circulation pump 20 in three stages based on the fuel temperature T detected by the temperature sensor 26.
That is, the first threshold temperature T1 and the second threshold temperature T2 (T1 <T2) are determined.
Then, the ECU 28 sets the drive current Ip = I if T ≦ T1, the drive current Ip = I / N if T1 <T <T2, and the drive current Ip = 0 if T2 ≦ T. Thus, the current control unit 56 is controlled.
In the present embodiment, the control unit that controls the flow rate of the circulation pump 20 based on the temperature T of the fuel stored in the second fuel storage unit 12 </ b> B includes the ECU 28 and the current control unit 56.

Therefore, in the second embodiment, it is needless to say that the same effect as in the first embodiment can be obtained, and the fuel stored in the second fuel storage unit 12B by the ECU 28 (control unit). The flow rate of the circulation pump 20 is controlled in three stages based on the temperature T of the above.
Therefore, the flow rate of the circulation pump 20 can be adjusted stepwise, which is more advantageous for finely controlling the temperature T of the fuel stored in the second fuel storage portion 12B. Therefore, it is more advantageous in suppressing the temperature of the fuel from being excessively increased and saving power in the circulation pump 20.

(Third embodiment)
Next, a third embodiment will be described.
FIG. 3 is a block diagram showing a configuration for controlling the flow rate of the circulation pump 20 of the vehicle fuel tank according to the third embodiment.
In the third embodiment, the drive current supplied from the power source 54 to the circulation pump 20 is controlled by using the bimetal switch 58 that detects the temperature T of the fuel flowing through the circulation pipe 18 and turns it on and off. Is.
That is, the bimetal switch 58 is provided at a location where the temperature T of the fuel passing through the circulation pipe 18 can be detected, and the bimetal switch 58 is connected in series between the power supply 54 and the input terminal of the circulation pump 20.
The bimetal switch 58 is turned on when the temperature T of the fuel flowing through the circulation pipe 18 is lower than the upper limit temperature TH, and turned off when the temperature becomes equal to or higher than the upper limit temperature TH.
Therefore, when the temperature T of the fuel flowing through the circulation pipe 18 is lower than the upper limit temperature TH, the fuel is circulated by the circulation pump 20, and when the temperature T of the fuel flowing through the circulation pipe 18 is equal to or higher than the upper limit temperature TH, Circulation is stopped.
In the present embodiment, the bimetal switch 58 includes a control unit that controls the flow rate of the circulation pump 20 based on the temperature T of the fuel stored in the second fuel storage unit 12B.
Therefore, in the third embodiment, the same effect as in the first embodiment can be obtained, and the control unit is composed of the bimetal switch 58, which is advantageous in reducing the cost. .

DESCRIPTION OF SYMBOLS 10 Fuel tank apparatus 12 Fuel tank 12A 1st fuel accommodating part 12B 2nd fuel accommodating part 14 1st transfer part 16 Transfer pipe 18 Circulation pipe 20 Circulation pump 22 Temperature rising part 24 Level gauge 2408 Case 26 Temperature sensor 28 ECU (control unit)
30 First reservoir cup 52 Second reservoir cup

Claims (5)

A fuel tank having a first fuel storage portion and a second fuel storage portion;
A transfer pipe having a suction port disposed in the second fuel storage section and a discharge port disposed in the first fuel storage section;
A first transfer unit disposed in the first fuel storage unit and configured to transfer fuel from the second fuel storage unit to the first fuel storage unit via the transfer pipe;
A circulation pipe having a suction port and a discharge port disposed in the second fuel storage unit;
A circulation pump for circulating the fuel accommodated in the second fuel accommodating portion to the circulation pipe;
A temperature raising part for raising the temperature of the fuel flowing through the circulation pipe;
A fuel tank apparatus comprising: The first fuel storage portion is provided with a first reservoir cup having a smaller volume than the first fuel storage portion,
The first transfer unit is accommodated in the first fuel storage unit in addition to transferring fuel from the second fuel storage unit to the first fuel storage unit via the transfer pipe. Transferring the fuel to the first reservoir cup;
The fuel tank device according to claim 1, wherein A second reservoir cup having a smaller volume than the second fuel storage unit is provided in the second fuel storage unit;
The inlet and outlet of the circulation pipe are located inside the second reservoir cup,
The fuel tank apparatus according to claim 1 or 2, wherein A level gauge for detecting a fuel level is provided in the second fuel storage unit,
The temperature raising unit is provided in a housing that houses the level gauge,
The fuel tank device according to claim 1, wherein the fuel tank device is a fuel tank device. A control unit is provided for controlling the flow rate of the circulation pump based on the temperature of the fuel stored in the second fuel storage unit;
The fuel tank device according to claim 1, wherein the fuel tank device is a fuel tank device.

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