DESC:TECHNICAL FIELD

Embodiments of the present disclosure relate to a vehicle. In particular, embodiments of the disclosure include fuel storage and supply system of the vehicle.

BACKGROUND
Presently, heavy commercial vehicles such as but not limiting to trucks and tractor trailers are commonly used for transporting goods over long distance. Especially, in case of tractor vehicle that carries heavy load and run for longer distance from one part of the country to another i.e. covering a distance in the range of 1000 km to 3000 km. Generally, the tractor trailer units are powered by high capacity diesel engine. Due to high power requirements, the tractor vehicles consume high quantity of fuel than the other vehicles. Because of heavy consumption of fuels, there is a requirement of large capacity or quantity of fuel tanks. This is conventionally met by periodic filling of tanks or by increasing the fuel carrying capacity. The problem with periodic tank filling is that fuel may or may not be available at right time at right place. In addition, fuel quality available in remote areas will be of great concern because of the non-availability of the fuel.

To overcome such problems larger quantity fuel carrying tanks are provided in the vehicles. , Such, larger quantity fuel carrying tanks increase the vehicle travel in one re-fill. However, accommodating larger quantity fuel carrying tanks is challenge in the vehicles due to space constraints.

As an alternative option two or more fuel tanks are fixed to the heavy vehicles to increase the fuel carrying capacity. The two or more fuel tanks are provided at different locations such as sides of the truck body and on top of the chassis behind the driver’s cabin.

One such arrangement is disclosed in prior arts. The arrangement comprises a primary fuel tank fixed at side of a vehicle, and an auxiliary tank mounted on top of the vehicle chassis behind the driver’s cabin. The primary fuel tank and the auxiliary fuel tanks are connected to an engine by separate valves and are controlled separately. This arrangement is complex and costly affair.

In the conventional arrangements if the auxiliary tank is connected to primary fuel tank by a pipeline, then there are high chances of fuel leakage when the end user tries to opens the cap of the fuel filling port. Further, since the fuel will be transferred from auxiliary tank to the primary tank continuously, there is a risk of fuel leakage from the berthing holes of the fuel tank, and it may even lead to overflow in the primary fuel tank.

Further, in some other conventionally known arrangements additional fuel tanks may be provided in downstream of the primary fuel tanks. But this pose the requirement of additional fuel pump to transfer the fuel from the auxiliary fuel tank to the primary fuel tank.

In light of foregoing discussion, it is observed to develop an improved fuel storage system for vehicles to overcome the limitations stated above.

OBJECTIVES
One object of the present disclosure is to provide a fuel storage system for a vehicle which increases fuel carrying capacity of a vehicle.

Another object of the present disclosure is to provide a fuel storage system for a vehicle which has an arrangement to facilitate automatic transfer of fuel from auxiliary tank to primary tank.

SUMMARY
The shortcomings of the prior art are overcome and additional advantages are provided through the provision of system as claimed in the present disclosure.

Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.

In one non-limiting embodiment of the present disclosure there is provided a vehicle fuel storage system. It comprises an auxiliary fuel tank fluidly connectable to a primary fuel tank of the vehicle, wherein the auxiliary fuel tank is configured to transfer fuel to the primary fuel tank using gravity. The system further comprises an arrangement for controlling fuel transfer from the auxiliary fuel tank to the primary fuel tank. The arrangement comprises a valve provisioned in a fluid flow line between the auxiliary fuel tank and the primary fuel tank to regulate fuel transfer from the auxiliary fuel tank to the primary fuel tank. A control unit interfaced with the valve, to operate the valve based on signal received from a plurality of fuel level sensors, wherein at least one of the plurality fuel level sensors is provided in each of the auxiliary fuel tank and the primary fuel tank.

In an embodiment of the present disclosure, the primary fuel tank is fluidly connected to the secondary fuel tank. The secondary fuel tank is configured to transfer fuel to the primary fuel tank through a fuel flow line by syphon principle.

In an embodiment of the present disclosure, at least one first three way connector with control valve, before the valve in the fluid flow line between the auxiliary fuel tank and the primary fuel tank. The first outlet of the first three way connector with control valve is connected to the valve, and the second outlet is connected to a bypass line.

In an embodiment of the present disclosure, at least one second three way connector after the valve in the fluid flow line between the auxiliary fuel tank and the primary fuel tank. The first inlet of the second thee way connector is connected to an outlet of the valve, and an outlet of the second three way connector is connected to the primary fuel tank. Further, a second inlet of the second three way connector is connected to the bypass line.

In an embodiment of the present disclosure, the first three way connector with control valve is configured to be operated manually to transfer the fuel from an auxiliary fuel tank to a primary fuel tank through a bypass line.

In an embodiment of the present disclosure, the valve is selected from at least one of solenoid valve, pneumatic valve, and hydraulic valve.

In an embodiment of the present disclosure, the auxiliary fuel tank is fluidly connected to the primary fuel tank through a manual control valve to control the fuel flow.

A method for transferring fuel from an auxiliary fuel tank to a primary fuel tank of a vehicle using gravity. The method comprising acts of receiving fuel level signal from a plurality of fuel level sensors, wherein the at least one of the plurality of fuel level sensors is provided in each of the auxiliary fuel tank and the primary fuel tank. Then, operating a valve by a control unit based on the received signals from plurality of fuel level sensors by the control unit to regulate the transfer of fuel from the auxiliary tank to the primary tank.

In an embodiment of the present disclosure, the control unit analyses the received signals from plurality of fuel level sensors by comparing with a predefined limit. The control unit operates the valve if the fuel level sensed by the plurality sensors is below the predefined limit.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE DRAWINGS
The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:

FIGURE 1 illustrates a side view of the vehicle with a fuel storage system of the present disclosure.

FIGURE 2 illustrates a top view of the vehicle with a fuel storage system of the present disclosure.

FIGURE 3 illustrates a schematic representation fuel storage system of the vehicle of the present disclosure.

The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the system illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
The foregoing has broadly outlined the features and technical advantages of the present disclosure in order that the detailed description of the disclosure that follows may be better understood. Additional features and advantages of the disclosure will be described hereinafter which form the subject of the claims of the disclosure. It should be appreciated by those skilled in the art that the conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present disclosure. It should also be realized by those skilled in the art that such equivalent constructions do not depart from the spirit and scope of the disclosure as set forth in the appended claims. The novel features which are believed to be characteristic of the disclosure, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures. It is to be expressly understood, however, that each of the figures is provided for the purpose of illustration and description only and is not intended as a definition of the limits of the present disclosure.

To overcome the problems stated in the background the present disclosure provides an improved fuel storage system for a vehicle. The fuel storage system of the present disclosure provides a flexibility to use plurality of fuel tanks in fuel storage system to increase the fuel capacity in vehicles. The plurality of fuel tanks may be mounted at desired locations such as sides and top side of chassis frame. The mounting of plurality fuel tanks on the chassis frame at same level raise packing issues in vehicle design. In order to avoid vehicle design issues, the auxiliary fuel tank is mounted on one of above the chassis and behind cab of the vehicle. Thus, the arrangement provides an advantage in transferring fuel from auxiliary tank to primary tank by virtue of gravity. In the vehicle, an engine takes fuel from a primary tank, and auxiliary tank is used for the storage of extra fuel. For utilizing complete fuel capacity, an automatic fuel transfer is maintained between the primary tank and the auxiliary tank. The gravitational flow fuel is used to transfers the fuel from the auxiliary tank to the primary tank. One of the issues is to transfer fuel from auxiliary tank to primary is to control fuel flow and direct it as per the fuel level in the primary tank, which is resolved using an arrangement having a microcontroller based electronic circuit. The arrangement comprises valve provided in fluid flow line between auxiliary tank and the primary tank, and a control unit to control a valve based on fuel level sensed by plurality of fuel level sensors in the primary tank and the auxiliary tank.

In an embodiment of the present disclosure, a secondary fuel tank is provided on the vehicle chassis, in opposite side of the primary fuel tank. The secondary fuel tank is kept in substantially same height of the primary fuel tank. The secondary fuel tank is connected to the primary fuel tank using a fuel flow pipe and configured to transfer the fuel from secondary fuel tank to the primary fuel tank using siphon principle.

Reference will now be made to figures which are exemplary embodiments of the present disclosure, as illustrated in the accompanying drawings. Where ever possible referral numerals will be used to refer to the same or like parts.

Figures 1 and 2 are exemplary embodiment of the present disclosure illustrating side view and top view of the vehicle provisioned with a fuel storage system (100). The fuel storage system (100) comprises plurality of fuel tanks (1, 2, and 3) mounted onto chassis of the vehicle. In an embodiment, the plurality of fuel tanks (1, 2, and 3) are three in number such as primary fuel tank (1), secondary fuel tank (2), and an auxiliary fuel tank (3), mounted on side and top of the chassis frame (10) of the vehicle. The primary fuel tank (1) and the secondary fuel tank (2) may be mounted at a same height on right and left side of the chassis frame (10), whereas the auxiliary fuel tank (3) may be mounted on top of frame assembly. As shown in FIGURE 2, the system the vehicle engine (25) takes fuel from primary tank (1) through fuel line (23), excessive fuel from engine return to primary tank (1) again through fuel line (24). All the three fuel tanks (1, 2 and 3) have respective own refilling points (not numbered), and the tanks (1, 2 and 3) can be refilled by removing filling caps (11, 12 and 13). The primary tank (1) and the secondary tank (2) are connected to each other by a fuel line (22). The siphoning principle is used to transfer the fuel from the secondary fuel tank (2) to primary fuel tank (1), thus the same fuel level in both primary and secondary fuel tanks (1 and 2) is maintained. However, placement of the secondary fuel tank (2) should not be consider limited to the embodiment shown in the figure. The positioning of the secondary tank (2) can be placed in any location of the vehicle. However the position should be such that it provides fuel supply to the primary tank thought syphoning effect. The auxiliary tank (3) is connected to the primary tank (1) through a fluid flow line (14) to transfer the fuel from auxiliary tank (3) to the primary tank (1) by virtue of gravity. The provision of plurality fuel tanks (1, 2, and 3) increases the total quantity of fuel storage in the vehicle. Further, placement of the auxiliary fuel tank (3) should not be considered to be limited to the embodiment shown in the figure. The positioning of the auxiliary tank (3) can be placed in any location of the vehicle. However, the position should be such that it provides fuel supply to the primary tank (1) through potential energy stored in it. Placement of the auxiliary fuel tank at a height more than that of the primary tank would still fall within the scope of this disclosure.

Figure 3 is an exemplary embodiment of the present disclosure which shows a schematic representation of fuel circulation arrangement form auxiliary tank (3) to the primary tank (1). As shown in figure 3, the auxiliary tank (3) is connected to the primary tank (1) by fuel flow line (14) which is a pipe through which the fuel can be transferred by the virtue of gravity. One of the issues is to transfer fuel from auxiliary tank to primary is to control fuel flow and direct it as per the fuel level in the primary tank, thus an arrangement (A) in the fluid flow line (14) for controlling fuel transfer from the auxiliary fuel tank (3) to the primary fuel tank (1) is provided in the fuel storage system (100) of the vehicle. The arrangement (A) comprises a valve (6) provisioned in a fluid flow line (14) between the auxiliary fuel tank (3) and the primary fuel tank (1) to regulate fuel transfer from the auxiliary fuel tank (3) to the primary fuel tank (1). At least one first three way connector (7) with control valve is provisioned before the valve (6) in the fluid flow line (14). A first outlet (7a) of the first three way connector (7) with control valve (7) is connected to the valve (6), and the second outlet (7b) is connected to a bypass line (18). The first three way valve (7) configured with both manual and electronic control. Thus, one first three way connector (7) with control valve allows the fuel to pass through valve (6) when it is in normal mode i.e. no manual intervention, and allows the fuel to flow through bypass line (18) when it is operated manually. Further, at least one second three way connector (26) is provisioned after the valve (6) in the fluid flow line (14) between the auxiliary fuel tank (3) and the primary fuel tank (1). An outlet (26c) of the second three way connector (26) is connected to the primary fuel tank (1) for transferring the fuel from auxiliary tank (3) to primary fuel tank (1) either manually or electronically. An outlet (6b) of the valve (6) is connected to a first inlet (26a) of the second three way valve (26) for transferring the fuel from auxiliary tank (3) to the primary tank (1) automatically, and a second inlet (26b) is connected to bypass line (18) for transferring the fuel from auxiliary tank (3) to primary fuel tank (1) manually. In one embodiment the auxiliary fuel tank (3) is fluidly connected to the primary fuel tank (1) through a manual control valve to control the fuel flow. Different methods of connecting the auxiliary fuel tank (3) with the primary fuel tank (1) fall within the scope of this disclosure.

The system (100) further includes plurality of fuel level sensors (4 and 5) to measure respective fuel levels. Each of the fuel tanks (1 and 3) are provided with at least one of the plurality of fuel level sensors (4 and 5) for measuring the fuel level in each of the auxiliary and primary fuel tank (3 and 1). The sensors (4 and 5) are interfaced to a controller (8) through wires (19 and 21) or through wireless medium for sending the fuel level in each of the auxiliary and primary fuel tank (3 and 1). The controller (8) compares the measured value of fuel level by the sensors (4 and 5) with the present value of the fuel level to operate the valve (6). The valve (6) is connected to the controller (8) e.g. through a wire (20), and said valve (6) is operated i.e. either turned on or off by the controller (8) to automatically regulate the transfer of fuel from auxiliary tank (3) to primary tank (1). In an embodiment of the present disclosure, the valve (6) is selected from group comprising but not limiting to solenoid valve, pneumatic valve and hydraulic valve. The valve (6) operates in a known manner to either allow or restrict the flow of fuel from auxiliary tank (3) to primary tank (1) through the flow line (14). In one embodiment the value could be operated such that the fuel flow can be controlled gradually i.e. the amount of fuel flow through the valve can be controlled. In one embodiment the controller is at least one of ECU, microcontroller, electronic circuit and processor.

The controller (8) is configured to operate in two methods to transfer the fuel flow from auxiliary tank (3) to primary tank (1) through the flow line (14). First method is a continuous fuel transfer and second method is one time fuel transfer. In the first method, when the controller (8) receives a signal from the fuel level sensor (5) about the fuel level change in the primary fuel tank (1), the controller switches on the valve (6) until the primary fuel tank (1) is restored to a predefined fuel level. Here, the controller (8) continuously operates the valve (6) to maintain the predefined level in the primary fuel tank (1) until the auxiliary fuel tank (3) is exhausted with fuel. In the second method, the controller (8) upon receiving a sensor signal about the fuel level drop in the primary fuel tank (1) below a predefine level, the controller (8) operates the solenoid valve (6) one time and transfers the fuel from the auxiliary fuel tank (3) to the primary fuel tank (1). The controller (8) switches OFF the solenoid valve (6) upon sensing a low level signal from the fuel level sensor (4) of the auxiliary fuel tank (3).

Further, the controller (8) displays the fuel level of the two fuel level sensor (4 and 5) on the display (9) which is mounted on drives dashboard. The total fuel capacity of tanks (1 and 3) is displayed in but not limiting to an electronic analog display (9) which shows the availability of fuel in a single display. The display (9) and the controller (8) are mounted on a dashboard of the vehicle. The display of fuel capacity in primary fuel tank (1) is also a representation of fuel in the secondary fuel tank (2) as the fuel between these tanks is exchanged by syphon principle. The signals regarding total fuel capacity available in a single analog display mounted on driver dashboard. Two fuel level sensors (4 and 5) are used in the primary and the auxiliary tank (1 and 3) for measuring quantity of the total fuel available. The two fuel level sensors (4 and 5) generate respective signals which are analysed by the controller to perform a predefine function. The controller (8) takes a decision of starting or stopping the valve (8) to control fuel transfer based on the signals from the two fuel level sensors (4 and 5).

In one embodiment of the present disclosure, the system is configured to manually allow the fuel transfer from auxiliary fuel tank (3) to primary fuel tank (1) for ensuring safety. For this operation, the first three connector control valve (7) is operated manually, which passes the fuel through bypass line (18) to primary fuel tank (1) through the second three way connector (26).

The advantages of the present disclosure are integrating of three fuel tanks in a vehicle which increases the fuel carrying capacity of the vehicle, and facilitates transfer of fuel from auxiliary fuel tank to primary fuel tank without manual intervention, and helps to remove costly parts like fuel transfer pump, and also results in low power consumption.

From the foregoing it will be appreciated that although various specific embodiments of the invention have been set forth herein, further modifications could also be made without deviating from the spirit and scope of the invention. For example, it will be well-understood that either more or fewer hydraulic lines may be utilized to perform the same function as the hydraulic lines mentioned herein. Therefore, the scope of the present invention is intended to be limited solely by the claims presented herein.

Equivalents

With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.

It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”

While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

Referral Numerals:
Reference Number Description
100 Fuel storage system
1 Primary fuel tank
2 Secondary fuel tank
3 Auxiliary fuel tank
4 and 5 Fuel level sensors
6 Valve
6b Outlet of valve
7 First three way connector
7a and 7b First and second outlets of First three way connector
8 Controller
9 Display
10 Vehicle chassis
11-13 Fuel caps
14 Fuel flow line
18 Bypass line
19 and 21 Wires connected between controller and sensors
20 Wire connected between controller and valve
23 Fuel inlet
24 Fuel return
25 Engine
26 Second three way connector valve
26a and 26b Inlets of Second three way connector valve
26c Outlet of Second three way connector valve
A Arrangement to control fuel flow from auxiliary to primary fuel tank

,CLAIMS:We claim:

1. A vehicle fuel storage system (100) comprising:
an auxiliary fuel tank (3) fluidly connectable to a primary fuel tank (1) of the vehicle, the auxiliary fuel tank (3) being configured to transfer fuel to the primary fuel tank (1) using gravity; and
an arrangement (A) for controlling fuel transfer from the auxiliary fuel tank (3) to the primary fuel tank (1), said arrangement comprising:
a valve (6) provisioned on a fluid flow line (14) between the auxiliary fuel tank (3) and the primary fuel tank (1) to regulate fuel transfer from the auxiliary fuel tank (3) to the primary fuel tank (1); and
a control unit (8) interfaced with the valve (6) to operate the valve (6) based on signal received from a plurality of fuel level sensors (4 and 5), wherein at least one of the plurality fuel level sensors (4 and 5) is provided in each of the auxiliary fuel tank (3) and the primary fuel tank (1).

2. The system as claimed in claim 1, wherein the primary fuel tank (1) is fluidly connected to a secondary fuel tank (2).

3. The system as claimed in claim 2, wherein the secondary fuel tank (2) is configured to transfer fuel to the primary fuel tank (1) thro ugh a fuel flow line (22) by syphon principle.

4. The system as claimed in claim 1, wherein at least one first three way connector (7) with control valve, before the valve (6) in the fluid flow line (14) between the auxiliary fuel tank (3) and the primary fuel tank (1).

5. The system as claimed in claim 4, wherein a first outlet (7a) of the first three way connector (7) with control valve (7) is connected to the valve (6), and a second outlet (7b) is connected to a bypass line (18).

6. The system as claimed in claim 1, wherein at least one second three way connector (26) after the valve (6) in the fluid flow line (14) between the auxiliary fuel tank (3) and the primary fuel tank (1).

7. The system as claimed in claim 6, wherein a first inlet (26a) of the second thee way connector (26) is connected to an outlet (26a) of the valve (6), and an outlet (26c) of the second three way connector (26) is connected to the primary fuel tank (1).

8. The system as claimed in claim 5 and 6, wherein a second inlet (26b) of the second three way connector (26) is connected to the bypass line (18).

9. The system as claimed in claim 4, wherein the first three way connector with control valve (7) is configured to be operated manually to transfer the fuel from an auxiliary fuel tank (3) to the primary fuel tank (1) through a bypass line (18).

10. The system as claimed in claim 1, wherein the valve (7) is selected from at least one of solenoid valve, pneumatic valve, and hydraulic valve.

11. The system as claimed in claim 1, wherein the auxiliary fuel tank (3) is fluidly connected to the primary fuel tank (1) through a manual control valve to control the fuel flow.

12. A method for transferring fuel from an auxiliary fuel tank (3) to a primary fuel tank (1) of a vehicle using gravity, said method comprising acts of:
receiving fuel level signal from at least one of plurality of fuel level sensors (4 and 5), wherein the at least one of the plurality of fuel level sensors (4 and 5) is provided in each of the auxiliary fuel tank (3) and the primary fuel tank (1); and
operating a valve (6) by a control unit (8) based on the received signals from plurality of fuel level sensors (4 and 5) to regulate the transfer of fuel from the auxiliary tank (3) to the primary tank (1).
13. The method as claimed in claim 12, wherein the auxiliary fuel tank (3) is fluidly connected to the primary fuel tank (1) through a manual control valve to control the fuel flow.

14. The method as claimed in claim 12, wherein the control unit (8) analyses the received signals from plurality of fuel level sensors (4 and 5) by comparing with a predefined limit.

15. The method as claimed in claims 12 and 14, wherein the control unit (8) operates the valve (6) if the fuel level sensed by the plurality sensors (4 and 5) is below the predefined limit.

16. A vehicle comprising fuel storage system as claimed in claim 1.