Description:

FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10, Rule 13]

“A FLUID PUMP”

HERO MOTOCORP LIMITED, an Indian Company at: The Grand Plaza, Plot No.2, Nelson Mandela Road, Vasant Kunj- Phase -II, New Delhi, India, 110 070

THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

FIELD OF THE INVENTION:
[001] The present invention relates generally to a fluid pump. More particularly, the invention relates to a fuel pump of a vehicle having external support for pump movement.

BACKGROUND OF THE INVENTION:
[002] Traditionally, a fluid pump such as a fuel pump comprises a housing accommodating a motor portion and a pump portion. The housing comprises a fuel inlet port for allowing entry of fuel into the pump portion and a fuel outlet port for allowing exit of fuel from the fuel pump. The motor portion comprises a stator part and a rotor part fixed to a shaft. The rotor part and the shaft are adapted to rotate with respect to the stator part. The pump portion comprising at least one impeller coupled to the shaft and adapted to rotate with the shaft. In the traditional fluid pump as described above, one or more of the rotating parts such as the rotor part, the shaft or the impeller may get jammed or clogged due to dirt particles or particulates in the fuel or fluid in which the pump is submerged and hence, the fluid pump may face a trouble in starting.

SUMMARY OF THE INVENTION:
[003] This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

[004] In one aspect of the invention, there is provided a fluid pump comprising a housing accommodating a motor portion and a pump portion, the motor portion driving the pump portion. In an embodiment of the invention; the housing comprises a fluid inlet port for allowing entry of fuel into the pump portion and a fluid outlet port for allowing exit of fluid from the fluid pump. In an embodiment of the invention, the motor portion comprises a stator part and a rotor part fixed to a shaft. The rotor part and the shaft are adapted to rotate with respect to the stator part. In an embodiment of the invention, the shaft defines a first end rotatably supported by the housing and a second end. In an embodiment of the invention, the pump portion comprises at least one impeller coupled to the shaft and adapted to rotate with the shaft. In an embodiment of the invention, the fluid pump further comprises a manual rotation mechanism provided to the second end of the shaft. The manual rotation mechanism is located outside of the housing for enabling manual rotation of the shaft.

[005] In another aspect of the invention, there is provided a fuel pump comprising a housing accommodating a motor portion and a pump portion. In an embodiment of the invention the motor portion drives the pump portion. In an embodiment of the housing comprises a fuel inlet port for allowing entry of fuel into the pump portion and a fuel outlet port for allowing exit of fuel from the fuel pump. In another embodiment of the invention, the motor portion comprises a stator part and a rotor part fixed to a shaft. The rotor part and the shaft rotate with respect to the stator part. In an embodiment of the invention, the shaft defines a first end rotatably supported by the housing and a second end. In an embodiment of the invention, the pump portion comprising at least one impeller coupled to the shaft and adapted to rotate with the shaft. In an embodiment of the invention, the fuel pump further comprises a manual rotation mechanism provided to the second end of the shaft. In an embodiment of the invention, the manual rotation mechanism is located outside of the housing for enabling manual rotation of the shaft.

[006] In another embodiment of the invention, the fuel pump is an in-tank fuel pump of a vehicle.

[007] In yet another embodiment of the invention, a rotation of the impeller exerts a centrifugal force upon the fuel that has entered into the housing and increases a pressure of the fuel while this fuel flows downstream of the impeller.

[008] In still another embodiment of the invention, the housing is further provided with at least one relief valve, the at least one relief valve comprises an excess flow valve and a back pressure relief valve.

[009] In a further embodiment of the invention, the manual rotation mechanism is attached to the second end of the shaft or is integrally formed on the second end of the shaft.

[0010] In a furthermore embodiment of the invention, the manual rotation mechanism is selected from a group comprising a hand-operable member and a tool operable member.

[0011] In an embodiment of the invention, the manual rotation mechanism is selected from group comprising aperture, nut, bolt, screw, key, stud, pin, and string.

[0012] In another embodiment of the invention, the nut is selected from a group comprising Hexagonal nut, Flange nut, Knurled nut, Square nut, Thumb nut, Wing nut, Cap nut, Capstan nut, and Ring nut.

[0013] In another embodiment of the invention, the bolt is selected from a group comprising Cheese head bolt, T-Head bolt, Hexagonal bolt, Eye bolt, Hook bolt, Countersunk head bolt, and Square head bolt.

[0014] In another embodiment of the invention, the screw is selected from a group comprising Deck Screw, Dry wall screw, Flat head screw, Hex leg screw, Masonry screw, Machine screw, and Sheet metal screw.

[0015] In another embodiment of the invention, the key is selected from a group comprising Square key, Gib-head key, Feather key, Flat head key, Saddle key, Woodruff key, Dowel key, and Taper key.

[0016] In another embodiment of the invention, the stud is selected from a group comprising Weld bolt stud and Bonding stud.

[0017] In another embodiment of the invention, the pin is selected from a group comprising Threaded Clevis pin, Non-threaded Clevis pin, Hair Pin, Split pin, Circle Cotter pin, and Bow tie cotter pin.

[0018] In another aspect of the invention, there is provided a vehicle comprising a fuel tank adapted to hold a fuel and a fuel pump adapted to pump the fuel to a fuel injector. In an embodiment of the invention the fuel pump comprises a housing accommodating a motor portion and a pump portion. In an embodiment of the invention the motor portion drives the pump portion. In an embodiment of the invention, the housing comprises a fuel inlet port for allowing entry of fuel into the pump portion and a fuel outlet port for allowing exit of fuel from the fuel pump. In an embodiment of the invention, the motor portion comprises a stator part and a rotor part fixed to a shaft. In an embodiment of the invention, the rotor part and the shaft are adapted to rotate with respect to the stator part. In an embodiment of the invention, the shaft defines a first end rotatably supported by the housing and a second end. In another embodiment of the invention, the pump portion comprises at least one impeller coupled to the shaft and adapted to rotate with the shaft. In another embodiment of the invention, the fuel pump further comprises a manual rotation mechanism provided to the second end of the shaft. In an embodiment of the invention, the manual rotation mechanism is located outside of the housing for enabling manual rotation of the shaft.

[0019] Advantages of invention are that by actuating the manual rotation mechanism, a jam in the fluid pump and more particularly the fuel pump can be overcome. Thus, a jammed fluid pump and more particularly, a jammed fuel pump can be started easily. Since the manual rotation mechanism is located outside of the housing, the same can be accessed easily.

[0020] Another advantage of the invention is that the manual rotation mechanism can be actuated either by hand or by a tool and hence, there is a substantial ease in actuating the manual rotation mechanism. Yet another advantage of the invention is that the manual rotation mechanism can be incorporated without substantial modification of the fluid pump and more particularly the fuel pump. Still another advantage of the invention is that the cost of providing the manual rotation mechanism is very less.

[0021] To further clarify the advantages and features of the invention, a more particular description of the invention will be rendered by reference to specific embodiments thereof, which is illustrated in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail with the accompanying drawings.

BRIEF DESCRIPTION OF THE FIGURES:
[0022] In order that the invention may be readily understood and put into practical effect, reference will now be made to exemplary embodiments as illustrated with reference to the accompanying drawings, where like reference numerals refer to identical or functionally similar elements throughout the separate views. The figures together with a detailed description below, are incorporated in and form part of the specification, and serve to further illustrate the embodiments and explain various principles and advantages, in accordance with the present invention where:

[0023] Figure 1 illustrates a first side view of a vehicle, in accordance with an embodiment of the present invention;

[0024] Figure 2 illustrates a second side view of the vehicle, in accordance with an embodiment of the present invention;

[0025] Figure 3 illustrates a side view of the fuel tank, in accordance with an embodiment of the present invention;

[0026] Figure 4 illustrates a sectional view of the fluid pump / fuel pump, in accordance with an embodiment of the present invention; and

[0027] Figure 5 illustrates a close-up view of the impeller, in accordance with an embodiment of the present invention.

[0028] It may be noted that to the extent possible, like reference numerals have been used to represent like elements in the drawings. Further, skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and may not have been necessarily been drawn to scale. For example, the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help to improve understanding of aspects of the present invention. Furthermore, one or more elements may have been represented in the drawings by conventional symbols, and the drawings may show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the drawings with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein.

Detailed Description of the Invention:
[0029] For the purpose of promoting an understanding of the principles of the invention, reference will now be made to the embodiment illustrated in the drawings and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended, such alterations and further modifications in the illustrated device, and such further applications of the principles of the invention as illustrated therein being contemplated as would normally occur to one skilled in the art to which the invention relates.

[0030] It will be understood by those skilled in the art that the foregoing general description and the following detailed description are explanatory of the invention and are not intended to be restrictive thereof.

[0031] As used in the description herein and throughout the claims that follow, the meaning of “a,” “an,” and “the” includes plural reference unless the context clearly dictates otherwise. Also, as used in the description herein, the meaning of “in” includes “in” and “on” unless the context clearly dictates otherwise.

[0032] Reference throughout this specification to “an aspect”, “another aspect” or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, appearances of the phrase “in an embodiment”, “in another embodiment”, and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment.

[0033] The terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that one or more devices or sub-systems or elements or structures or components proceeded by "comprises... a" does not, without more constraints, preclude the existence of other devices or other sub-systems or other elements or other structures or other components or additional devices or additional sub-systems or additional elements or additional structures or additional components.

[0034] As used herein, and unless the context dictates otherwise, the terms "coupled to", “connected to”, “operably connected to”, and “operatively connected to” are intended to include both direct connection / coupling (in which two elements that are coupled / connected to each other contact each other) and indirect coupling / connection (in which at least one additional element is located between the two elements). Therefore, the terms "coupled to" and "coupled with" are used synonymously. Similarly, the terms “connected to” and “connected with” are used synonymously.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one ordinary skilled in the art to which this invention belongs. The device, methods, and examples provided herein are illustrative only and not intended to be limiting.

[0036] The use of any and all examples, or exemplary language (e.g. “such as”) provided with respect to certain embodiments herein is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as being essential to the practice of the invention.

[0037] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all Markush groups used in the appended claims.

[0038] Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

[0039] The terms “front / forward”, “rear / rearward / back / backward”, “up / upper / top”, “down / lower / lower ward / downward, bottom”, “left / leftward”, “right / rightward” used therein represents the directions as seen from a vehicle driver sitting astride and these directions are referred by arrows F, R, U, D in the Figures.

[0040] While the present invention is illustrated in the context of a vehicle, however, cover and aspects and features thereof can be used with other types of vehicles as well. The terms “vehicle”, “two-wheeled vehicle” and “motorcycle” have been interchangeably used throughout the description. The term “vehicle” comprises vehicles such as motorcycles, scooters, bicycles, mopeds, scooter type vehicles, All-Terrain Vehicles (ATV) and the like.

[0041] Referring to Figure 1and Figure 2there is illustrated a vehicle (10) that comprises a front end structure (12), a rear end structure (14), and a footboard (16). The front end structure (12) forms the front portion of the vehicle (10). The rear end structure (14) forms the rear portion of the vehicle (10). The footboard (16) lies between the front end structure (12) and the rear end structure (14). The footboard (16) provides footrest for a rider riding the vehicle (10).

[0042] The front end structure (12) comprises a front ground engaging member (18), and a steering mechanism (20). The front ground engaging member (18) is operatively connected to the steering mechanism (20). In the illustrated example, the front ground engaging member (18) embodies a wheel. Alternatively, the front ground engaging member (18) embodies a track, without limiting the scope of the invention. The steering mechanism (20) comprises a front fork (24) supported on the head pipe (22) in a steerable manner and a handlebar (26) for steering the front ground engaging member (18) operationally coupled to the front fork (24). The handlebar (26) is configured to be rotated by the rider to steer the vehicle (10). The vehicle (10) further comprises a main frame (28) supporting the front end structure (12), the footboard (16), and the rear end structure (14).

[0043] Further, the front end structure (12) comprises a front cover (30) and a leg shield (32) at least partially covering the head pipe (22). The leg shield (32) provides protection for the feet of the rider of the vehicle (10). The front end structure (12) further comprises a dash assembly (not shown). The dash assembly comprises a display unit (not shown). The display unit displays information about the vehicle (10) to the rider. The dash assembly may comprise additional components such as LCD, GPS, graphical user interface (GUI), etc. without limiting the scope of the invention. The dash assembly is supported on the handlebar (26). The front end structure (12) may further comprise additional components such as handle cover, windscreen, headlight, mirror(s), turn indicator(s), etc. without limiting the scope of the invention.

[0044] The main frame (28) extends in a downward and rearward direction of the vehicle (10) from the head pipe (22). A first seat frame (34) extends in a rearward direction of the vehicle (10) from a first side of the main frame (28), and a second seat frame (36) extends in a rearward direction of the vehicle (10) from a second side of the main frame (28).

[0045] The rear end structure (14) comprises a seat (38) and a rear ground engaging member (40). The seat (38) provides seating for a rider of the vehicle (10). The seat (38) is supported by the first seat frame (34) and the second seat frame (36). The rear ground end structure further comprises a power unit (not visible) disposed below the seat (38) and a storage compartment (not visible) disposed over the power unit and under the seat (38).The rear ground engaging member (40) under the seat (38) is driven by the power unit. The power unit may be any of an internal combustion engine. In the illustrated example, the rear ground engaging member (40) embodies a wheel. Alternatively, the rear ground engaging member (40) embodies a track, without limiting the scope of the invention.

[0046] The rear end structure (14) comprises a first cover (42) extending in a rearward direction of the vehicle (10) so as to at least partially cover the first seat frame (34) from a first side; and a second cover (44) extending in a rearward direction of the vehicle (10) so as to at least partially cover the second seat frame (36) from a second side. The first cover (42) and the second cover (44) additionally cover the internal combustion engine, a fuel tank (46) and other components of the vehicle (10) such as but are not limited to electronic control unit for controlling operation of the vehicle, fuse elements, inverter, Power Distribution Unit (PDU), telemetry unit for establishing connection between the vehicle and an external device, etc.

[0047] Referring to Figure 3, which illustrates a side view of the fuel tank (46), in an embodiment of the invention, the fuel tank (46) is adapted to hold a fuel and supply the fuel to the internal combustion engine. The fuel tank (46) comprises a fuel entry port (48) through which the fuel can be filled in the fuel tank (46). The fuel tank (46) accommodates a fuel pump (100) that is adapted to withdraw the fuel from the fuel tank (46) and supply the same to the internal combustion engine.

[0048] Now referring to Figure 4, there is illustrated a sectional view of the fluid pump (100) which may be configured to operate as the fuel pump (100) and may be fitted to the fuel tank (46).In an embodiment of the invention, the fluid pump or alternatively the fuel pump (100) comprises a housing (102) accommodating a motor portion(104) and a pump portion (106). During operation of the fluid pump or the fuel pump (100), the motor portion (104) is adapted to drive the pump portion (106). In an embodiment of the invention the housing (102) comprises a fuel inlet port (108) for allowing entry of fuel into the pump portion (106) and a fuel outlet port (110) for allowing exit of fuel from the fluid pump (100) or alternatively the fuel pump (100).

[0049] In an embodiment of the invention, the motor portion(104) comprises a stator part (112) and a rotor part (114) fixed to a shaft (116). In an invention, the rotor part (114) is placed so as to be concentric with respect to the stator part (112) and the shaft (116) passes through the rotor part (114). During operation, the rotor part (114) and the shaft (116) are adapted to rotate with respect to the stator part (112). In particular, one of the stator part (112) and the rotor part (114) comprises a coil element via which a current can be passed and another of the stator part (112) and the rotor part (114) comprises magnets. Although not visible, the housing (102) may be provided with electrical connectors for supplying current from an external source to the coil element thereby operating the fluid pump or alternatively the fuel pump (100).

[0050] In an embodiment of the invention, the shaft (116) defines a first end (120) and a second end (122). In an embodiment of the invention, the first end (120) of the shaft (116) is rotatably supported by the housing (102). For instance, the housing (102) comprises a first end cover (130) located adjacent to the motor portion (104) supporting the first end (120) of the shaft (116). In an embodiment of the invention, the first end (120) of the shaft (116) is rotatable supported by a first bearing (132) and the first bearing (132) is supported by the first end cover (130).

[0051] In an embodiment of the invention, the pump portion (106) comprises at least one impeller (118) coupled to the shaft (116) and adapted to rotate with the shaft (116). In an embodiment of the invention, the at least one impeller (118) is placed within a pump chamber (134). In an embodiment of the invention, the pump chamber (134) supports an intermediate portion (136) of the shaft (116). In an embodiment of the invention, the intermediate portion (136) of the shaft (116) is rotatable supported by a second bearing (138) and the second bearing (138) is supported by the pump chamber (134). In an embodiment of the invention, a rotation of the impeller (118) exerts a centrifugal force upon the fuel that has entered into the housing (102) and increases a pressure of the fuel while this fuel flows downstream of the impeller (118). By way of a non-limiting example, as shown in Figure 5in an embodiment of the invention, the impeller (118) is substantially disc-shaped member comprising a plurality of concavities (126), the disc shaped member adapted to rotate within the housing (102).

[0052] In an embodiment of the invention, the fluid pump (100) or alternatively the fuel pump (100) comprises a manual rotation mechanism (124) provided to the second end (122) of the shaft (116). It can be seen that the manual rotation mechanism (124) is being located outside of the housing (102) for enabling manual rotation of the shaft (116).

[0053] In an embodiment of the invention, the housing (102) is further provided with at least one relief valve (128), the at least one relief valve (128) comprises an excess flow valve and a back pressure relief valve. The at least one relief valve (128) ensures that fuel pressure inside the fluid pump (100) or alternatively the fuel pump (100) does not exceed a predetermined value. Thus, the at least one relief valve (128) ensures safe operation of the fluid pump (100) or alternatively the fuel pump (100).

[0054] In an embodiment of the invention, the manual rotation mechanism (124) is attached to the second end (122) of the shaft (116) or is integrally formed on the second end (122) of the shaft (116), it being advantageous to integrally form the manual rotation mechanism (124) on the second end (122) of the shaft (116).

[0055] In an embodiment of the invention, the manual rotation mechanism (124) is selected from a group comprising a hand-operable member and a tool operable member. In another embodiment of the invention, the manual rotation mechanism (124) is selected from a group comprising aperture, nut, bolt, screw, key, stud, pin, and string. By way of non-limiting example, the nut is selected from a group comprising Hexagonal nut, Flange nut, Knurled nut, Square nut, Thumb nut, Wing nut, Cap nut, Capstan nut, and Ring nut. By way of another non-limiting example, the bolt is selected from a group comprising Cheese head bolt, T-Head bolt, Hexagonal bolt, Eye bolt, Hook bolt, Countersunk head bolt, and Square head bolt. By way of another non-limiting example, the screw is selected from a group comprising Deck Screw, Dry wall screw, Flat head screw, Hex leg screw, Masonry screw, Machine screw, and Sheet metal screw. By way of a still another non-limiting example, the key is selected from a group comprising Square key, Gib-head key, Feather key, Flat head key, Saddle key, Woodruff key, Dowel key, and Taper key. By way of a further non-limiting example, the stud is selected from a group comprising Weld bolt stud and Bonding stud. By way of a furthermore non-example, the pin is selected from a group comprising Threaded Clevis pin, Non-threaded Clevis pin, Hair Pin, Split pin, Circle Cotter pin, and Bow tie cotter pin. By way of yet another non-limiting example, the aperture may be provided on the second end (122) of the (116) and a key or a rod element may be inserted into the aperture and used for rotating the fluid pump (100) or alternatively the fuel pump (100). By way of a further non-limiting example, one end of the string may be attached to the shaft (116) and another end of the string may be provided so as to accessible by a user. In an embodiment of the invention, the string may be partly rotated around the shaft (116). Thus, by pulling the string, the shaft (116) may be rotated in a manner similar to that of a ‘top’.

[0056] By providing the manual rotation mechanism (124) to the second end (122) of the shaft (116), it becomes possible to provide an initial torque to the fluid pump (100) or alternatively the fuel pump (100). This initial torque will assist in de-jamming the one or more of the rotating parts such as the rotor part, the shaft or the impeller. Once the jam of the one or more of the rotating parts has been successfully removed, the fluid pump (100) or alternatively the fuel pump (100) can be started without any problem. It may be noted that the initial torque may be provided to the fluid pump (100) or alternatively the fuel pump (100) via the manual rotation mechanism (124) and at the same time, current may be supplied to the coil element. It may be noted that a direction of the initial torque provided to the fluid pump (100) or alternatively the fuel pump (100) via the manual rotation mechanism (124) can be changed to effectively remove the jam of the one or more of the rotating parts.

[0057] It may be noted that while in Figure 3, the fuel tank is shown to comprise the fuel pump (100) and hence, the fuel pump (100) is an in-tank fuel pump, in an alternative embodiment of the fuel pump (100) may be coupled to the fuel tank (46) and hence, the fuel pump (100) may be out-of-tank fuel pump. In case the fuel pump (100) is an in-tank fuel pump, the manual rotation mechanism (124) is located outside of the fuel tank (46) for enabling manual rotation of the shaft (116).

[0058] Advantages of invention are that by actuating the manual rotation mechanism, a jam in the fluid pump and more particularly the fuel pump can be overcome. Thus, a jammed fluid pump and more particularly, a jammed fuel pump can be started easily. Since the manual rotation mechanism is located outside of the housing, the same can be accessed easily.

[0059] Another advantage of the invention is that the manual rotation mechanism can be actuated either by hand or by a tool and hence, there is a substantial ease in actuating the manual rotation mechanism. Yet another advantage of the invention is that the manual rotation mechanism can be incorporated without substantial modification of the fluid pump and more particularly the fuel pump. Still another advantage of the invention is that the cost of providing the manual rotation mechanism is very less.

[0060] While specific language has been used to describe the disclosure, any limitations arising on account of the same are not intended. As would be apparent to a person in the art, various working modifications may be made to the method in order to implement the inventive concept as taught herein.

[0061] The figures and the forgoing description give examples of embodiments. Those skilled in the art will appreciate that one or more of the described elements may well be combined into a single functional element. Alternatively, certain elements may be split into multiple functional elements. Elements from one embodiment may be added to another embodiment. The scope of embodiments is by no means limited by these specific examples. Additionally, numerous variations, whether explicitly given in the specification or not, such as differences in structure, dimension, and use of material, are possible.
, Claims:WE CLAIM:

1. A fuel pump (100), comprising:
a housing (102) accommodating a motor portion (104) and a pump portion (106), the motor portion (104) driving the pump portion (106); the housing (102) comprising a fuel inlet port (108) for allowing entry of fuel into the pump portion (106) and a fuel outlet port (110) for allowing exit of fuel from the in-tank fuel pump (100);
the motor portion(104) comprises a stator part (112) and a rotor part (114) fixed to a shaft (116), the rotor part (114) and the shaft (116) rotating with respect to the stator part (112), the shaft (116) defining a first end (120) rotatably supported by the housing (102) and a second end (122);
the pump portion (106) comprising at least one impeller (118) coupled to the shaft (116) and adapted to rotate with the shaft (116); and
a manual rotation mechanism (124) provided to the second end (122) of the shaft (116), the manual rotation mechanism (124) being located outside of the housing (102) for enabling manual rotation of the shaft (116).

2. The fuel pump (100) as claimed in claim 1, wherein the fuel pump (100) is an in-tank fuel pump of a vehicle.

3. The fuel pump (100) as claimed in claim 1, wherein a rotation of the impeller (118) exerts a centrifugal force upon the fuel that has entered into the housing (102) and increases a pressure of the fuel while this fuel flows downstream of the impeller (118).

4. The fuel pump (100) as claimed in claim 1, wherein the housing (102) is further provided with at least one relief valve (128), the at least one relief valve (128) comprises an excess flow valve and a back pressure relief valve.

5. The fuel pump (100) as claimed in claim 1, wherein the manual rotation mechanism (124) is attached to the second end (122) of the shaft (116) or is integrally formed on the second end (122) of the shaft (116).

6. The fuel pump (100) as claimed in claim 1, wherein the manual rotation mechanism (124) is selected from a group comprising a hand-operable member and a tool operable member.

7. The fuel pump (100) as claimed in claim 1, wherein the manual rotation mechanism (124) is selected from a group comprising aperture, nut, bolt, screw, key, stud, pin, and string.

8. The fuel pump (100) as claimed in claim 7, wherein:
• the nut is selected from a group comprising Hexagonal nut, Flange nut, Knurled nut, Square nut, Thumb nut, Wing nut, Cap nut, Capstan nut, and Ring nut;
• the bolt is selected from a group comprising Cheese head bolt, T-Head bolt, Hexagonal bolt, Eye bolt, Hook bolt, Countersunk head bolt, and Square head bolt;
• the screw is selected from a group comprising Deck Screw, Dry wall screw, Flat head screw, Hex leg screw, Masonry screw, Machine screw, and Sheet metal screw;
• the key is selected from a group comprising Square key, Gib-head key, Feather key, Flat head key, Saddle key, Woodruff key, Dowel key, and Taper key;
• the stud is selected from a group comprising Weld bolt stud and Bonding stud; and
• the pin is selected from a group comprising Threaded Clevis pin, Non-threaded Clevis pin, Hair Pin, Split pin, Circle Cotter pin, and Bow tie cotter pin.

9. A vehicle comprising:
a fuel tank adapted to hold a fuel; and
a fuel pump (100) for pumping the fuel to a fuel injector, the fuel pump (100) comprising:
a housing (102) accommodating a motor assembly (104) and a pump portion (106), the motor portion (104) driving the pump portion (106); the housing (102) comprising a fuel inlet port (108) for allowing entry of fuel into the pump portion (106) and a fuel outlet port (110) for allowing exit of fuel from the fuel pump (100);
the motor portion (104) comprises a stator part (112) and a rotor part (114) fixed to a shaft (116), the rotor part (114) and the shaft (116) rotating with respect to the stator part (112), the shaft (116) defining a first end (120) rotatably supported by the housing (102) and a second end (122);
the pump portion (106) comprising at least one impeller (118) coupled to the shaft (116) and adapted to rotate synchronously with the shaft (116); and
a manual rotation mechanism (124) provided to the second end (122) of the shaft (116), the manual rotation mechanism (124) being located outside of the housing (102) for enabling manual rotation of the shaft (116).

10. A fluid pump (100), comprising:
a housing (102) accommodating a motor portion (104) and a pump portion (106), the motor portion (104) driving the pump portion (106); the housing (102) comprising a fluid inlet port (108) for allowing entry of fuel into the pump portion (106) and a fluid outlet port (110) for allowing exit of fluid from the fluid pump (100);
the motor portion (104) comprises a stator part (112) and a rotor part (114) fixed to a shaft (116), the rotor part (114) and the shaft (116) rotating with respect to the stator part (112), the shaft (116) defining a first end (120) rotatably supported by the housing (102) and a second end (122);
the pump portion (106) comprising at least one impeller (118) coupled to the shaft (116) and adapted to rotate with the shaft (116); and
a manual rotation mechanism (124) provided to the second end (122) of the shaft (116), the manual rotation mechanism (124) being located outside of the housing (102) for enabling manual rotation of the shaft (116).