CLIAMS:1. A fuel extraction system (100) for a fuel tank (10), the fuel extraction system (100) comprising:
a suction pump (102) adapted to be associated with the fuel tank (10) for selectively pumping out fuel therefrom;
a suction pipe (104) extending from the suction pump (102) in the fuel tank (10); and,
a rotatable suction tube (106) engaged with an end portion of the suction pipe (104), the rotatable suction tube (106) being adapted to rotate with respect to the suction pipe (104) within the fuel tank (10).
2. The fuel extraction system (100) for a fuel tank (10), as claimed is claim 1, wherein the rotatable suction tube (106) further includes a weighted member (114) provided at a free end thereof.
3. The fuel extraction system (100) for a fuel tank (10), as claimed in claim 2, wherein the weighted member (114) is a dead weight, engaged with the free end of the rotatable suction tube (106).
4. The fuel extraction system (100) for a fuel tank (10), as claimed in claim 3, wherein the rotatable suction tube (106) rotates within the fuel tank (10) according to forces acting on the weighted member (114).
5. The fuel extraction system (100) for a fuel tank (10), as claimed in claim 4, wherein the rotatable suction tube (106) further includes a filtering member (116).
6. The fuel extraction system (100) for a fuel tank (10), as claimed in claim 5, wherein the filtering member (106) includes a pre-filter mesh.

7. The fuel extraction system (100) for a fuel tank (10), as claimed in claim 1, wherein the rotatable suction tube (106) is connected to the suction pipe (104) with a rotatable joint (108).
8. The fuel extraction system (100) for a fuel tank (10), as claimed in claim 7, wherein the rotatable joint (108) is one of a socket and ball joint, and a collet-type joint.
9. The fuel extraction system (100) for a fuel tank (10), as claimed in claim 1, wherein the rotatable suction tube (106) has an L-shape configuration, wherein one end of a first leg (110) is rotatably connected to the suction pipe (104), and a second leg (112) being perpendicular to the first leg (110) is positioned along a base surface (12) of the fuel tank (10).
10. The fuel extraction system (100) for a fuel tank (10), as claimed in claim 9, wherein the rotatable connection of the rotatable suction tube (106) facilitates rotation of the rotatable suction tube (106), as and when the fuel tank tilts.
,TagSPECI:TECHNICAL FIELD
The present disclosure generally relates to fuel systems, and more particularly, to a fuel suction unit for an internal combustion engine.
BACKGROUND OF THE DISCLOSURE
Diesel engines right from the natural aspiration engines to the currently used common rail engines use a suction unit for supplying fuel to the internal combustion engine from the fuel tank. Some common rail engines as well as the gasoline engines use an In-tank pump for supplying fuel to the internal combustion engine from the fuel tank. In fact, all the internal combustion engines running on liquid Fuel use either a suction unit or an In-tank pump within the fuel tank for delivering the fuel to the engine.
Both the In-tank pump and the suction unit include a suction tip, which sucks the fuel. When the In-tank pump or the suction unit is operated, it is required that the suction tip of the In-tank pump or the suction unit is immersed in the fuel in order to avoid dry condition in the system and to ensure performance of the in-tank pump or suction unit. It is required also to avoid starvation of the internal combustion engine in any condition. Typically, in order to make sure that the suction tip of the In-tank pump or the suction unit is operational, a surge pot is employed. The surge pot can be understood as a miniature tank mounted on an internal bottom surface of the fuel tank. When the vehicle is operating in low fuel levels, and/or when vehicle takes a turn, the surge pot is required to make sure that the suction tip of the In-tank pump or the suction unit is immersed in the fuel.
However, despite the use of the surge pot there are instances of starvation of the engine, in certain conditions like, vehicle running on inclined surface, cornering etc. especially with low fuel levels in the tank. Such incidents happen as the fuel gets displaced to a corner of the tank, as per the orientation of the vehicle, and despite of the fuel being present in the tank, the engine may starve for the fuel.

OBJECTS OF THE DISCLOSURE
The objective of disclosure is to provide a reliable, cost effective, easy to manufacture, and simple fuel suction unit that overcomes or obviates the disadvantages associated with the prior art.
Another objective of the present disclosure is to provide a fuel suction unit that facilitates supply of fuel from fuel tank to the internal combustion engine even at low fuel level and vehicle cornering.
Another objective of the present disclosure is to provide a fuel suction unit that obviates the need for having a surge pot, and thus eliminates all the disadvantages associated therewith.
Further objects and features of the disclosure will become apparent from the following detailed description when considered in conjunction with the drawings.
SUMMARY OF THE DISCLOSURE
The disclosure relates to a fuel extraction system for a fuel tank, the fuel extraction system comprising: a suction pump adapted to be associated with the fuel tank for selectively pumping out fuel therefrom; a suction pipe extending from the suction pump in the fuel tank; and, a rotatable suction tube engaged with an end portion of the suction pipe, the rotatable suction tube being adapted to rotate with respect to the suction pipe within the fuel tank.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig.1 shows top perspective view of a fuel tank and a fuel suction unit, in accordance with an embodiment of the present disclosure.
Fig.2 shows a perspective view of the fuel suction unit with a suction unit, in accordance with an embodiment of the present disclosure.
Fig.3 shows a perspective view of the fuel suction unit with a fuel pump, in accordance with an embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE DISCLOSURE
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the disclosure only, and not for the purpose of limiting the same.
FIG. 1 to FIG. 3 illustrates schematic views of a fuel suction unit 100, in accordance to various embodiments of the present disclosure. The fuel suction unit 100 is adapted to be installed on a fuel tank 10 of a vehicle (not illustrated). It may herein be noted that the fuel suction unit 100 of the present disclosure finds application in vehicles of various kinds, such as a passenger vehicle or a commercial, having fuel tanks of various kind. The fuel tank 10 includes a base surface 12, sidewalls 14, and a top surface (not shown).
The fuel suction unit 100 may also be referred to as a fuel extraction system 100 which includes a suction pump 102. In one embodiment of the present disclosure, the suction pump 102 is a fuel pumpas illustrated in FIG. 2. In another embodiment of the present disclosure, the suction pump 102 may be a fuel pump. Further in other embodiments, the suction pump 102 may include any flow inducing machine, without deviating from the scope of the present disclosure.
The suction pump 102 of the fuel suction unit 100 is adapted to be associated with the fuel tank 10. The suction pump 102 when operated, selectively pumps out fuel from the fuel tank 10. More specifically, the suction pump 102 when operated creates a pressure which forces the fuel in the fuel tank 10 to get sucked.
A suction pipe 104 is connected to the suction pump 102. More specifically, the suction pipe 104 is extending from the suction pump 102 in the fuel tank 10, as best shown in FIG. 1.
A rotatable suction tube 106 is engaged with an end portion of the suction pipe 104. The rotatable suction tube 106 is adapted to rotate with respect to the suction pipe 104 within the fuel tank 10. The rotatable suction tube 106 is connected to the suction pipe 104 with a rotatable joint 108. The rotatable joint 108 may be one of a socket and ball joint or a collet-type joint, a quick connector type joint and the like.
As best shown in FIGS. 2, and 3, the rotatable suction tube 106 has an L-shape configuration, wherein one end of a first leg 110 is rotatably connected to the suction pipe 106, and a second leg 112 being perpendicular to the first leg 110 is positioned along a base surface 12 (shown in FIG. 1) of the fuel tank 10.
The rotatable suction tube 106 of the fuel extraction system 100 further includes a weighted member 114 provided at a free end thereof. In one embodiment, the weighted member 114 provided at the free end of the rotatable suction tube 106 is a dead weight. Because of the rotatable connection of the rotatable suction tube 106, the rotatable suction tube 106 is free to rotate within the fuel tank 10 according to the forces acting on the weighted member 114 of the rotatable suction tube 106.
Further, the rotatable suction tube 106 also includes a filtering member 116. The filtering member 116 in one embodiment of the present disclosure is a pre-filter mesh. The Pre Filter mesh may be a combination of filter media & Reinforcement 118 which helps to avoid the impurities from entering the suction unit or the In-tank pump, which would otherwise clog the path of the fuel. Also, it would distribute the weight on the suction tip and make it easily rotatable.
During utilization, the fuel suction unit 100 assists in giving a continuous and an uninterrupted supply of fuel in all conditions, also taking into account the various shapes of the tank and all types of suction arrangements used. During operation of the vehicle having the fuel suction unit 100 in a fuel tank which is substantially filled, the fuel suction unit 100 extracts the fuel from the fuel tank 10, and supplies it to the internal combustion engine. Further, when the fuel level in the fuel tank 10 goes down below a predetermined level, and when the vehicle is in movement i.e. when the vehicle is encountering curves or when the vehicle tilts, the fuel tends to move in the fuel tank 10. In such conditions, because of the rotatable connection of the rotatable suction tube 106 and because of the dead weight 114, the rotatable suction tube 106 also rotates, as and when the fuel tank tilts. This rotatability of the rotatable suction tube 106 allows it to be moved and reach parts of the fuel tank 10, where fuel may have reached because of the various forces on the fuel and the fuel tank 10.
The foregoing description provides specific embodiments of the present disclosure. It should be appreciated that these embodiment are described for purpose of illustration only, and that numerous other alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the disclosure. It is intended that all such modifications and alterations be included insofar as they come within the scope of the disclosure as claimed or the equivalents thereof.

Referral Numerals Description
100 Fuel Suction Unit/Fuel extraction system
10 Fuel tank
12 Base surface
14 Sidewalls
102 Suction pump
104 Suction pipe
106 Rotatable suction tube

108 Rotatable joint
110 First leg
112 Second leg
114 Weighted member
116 Filtering member
118 Reinforcement