Claims:We Claim:
1. A fuel tank (200) in a fuel injection system (100); said fuel tank (200) comprising:
an inlet (201) and an outlet (202), said inlet (201) adapted to receive the fuel from a source and deliver via said outlet (202) of said fuel tank (200) to a pump (300);
characterized in that:
a filter (203) positioned in the fuel tank (200), separating the fuel tank (200) into an unfiltered portion (200a) and a filtered portion (200b), said filter (203) adapted to filter the fuel from said unfiltered portion (200a).

2. The fuel tank (200) as claimed in claim 1, wherein fuel from filtered portion (200b) flows into said pump via said outlet (202) of said fuel tank (200).

3. The fuel tank (200) as claimed in claim 1, wherein said filter (203) comprising a filter element (203a) and at least one mesh (203b) surrounding said filter element (203a) from each side.

4. The fuel tank (200) as claimed in claim 1, wherein said filter (203) is positioned inside said fuel tank (200) by a means (204).

5. The fuel tank (200) as claimed in claim 1, wherein said filter (203) is positioned inside said fuel tank (200) by a snap fit.

6. The fuel tank (200) as claimed in claim 1, wherein a sealing element (205) adapted to seal the filter (203) from both ends.
, Description:Complete Specification:
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] The invention relates to a fuel tank in a fuel injection system.

Background of the invention
[0002] In Common rail fuel injection system, the fuel tank acts as a reservoir for the fuel from where the fuel is sucked into the pump. The system has a filter outside the tank to filter the fuel before it flows to the pump so that the filtered fuel flows into the system in order to increase the efficiency.

[0003] The patent application US6192677 B1 discloses a fuel supply system installed inside a fuel tank as part of a cover closing an opening of the fuel tank. The fuel filter is fixed integrally to the cover and a fuel pump is mounted via the fuel filter. The fuel filter is in the shape of a partial annulus disposed in a certain angular range. Such system parts as a pressure regulator, an electric connector, a fuel level gauge and a fuel pipe are contained in the remaining angular range of the fuel pump periphery where the fuel filter is not disposed.

Brief description of the accompanying drawings:
[0004] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawings:

[0005] FIG. 1 illustrates a common rail injection system according to an embodiment in the invention; and

[0006] FIG. 2 illustrates a fuel tank according to an embodiment in the invention.

Detailed description of the embodiments
[0007] Figure 1 illustrates a common rail fuel injection system 100 according to an embodiment of the disclosure. The fuel flows from the fuel tank 200 to the pump 300. From pump 300, the pressurized fuel is delivered to the high-pressure common rail 400 and the excess fuel from the pump 300 is delivered back to the fuel tank 200. From the common rail 400, this pressurized fuel flows to the injector 500 and based upon the requirement the fuel is injected into the combustion chamber of engine by injector 500. The flow of the fuel is controlled by the control unit 600.

[0008] Figure 2 illustrates a fuel tank 200 in a fuel injection system according to an embodiment of the disclosure. The fuel tank 200 comprises an inlet 201 and an outlet 202. The inlet 201 is adapted to receive the fuel from a source and deliver via the outlet 202 of the fuel tank 200 to a pump 300. The fuel tank 200 further comprises a filter 203 positioned in the fuel tank 200, separating the fuel tank 200 into an unfiltered portion 200a and a filtered portion 200b. The filter 203 is adapted to filter the fuel from the unfiltered portion 200a.

[0009] The unfiltered portion 200a here refers to the portion containing the unfiltered fuel at the initial stage. This unfiltered fuel contains the fuel from the source and also from the fuel flowing back from the pump 300, the common rail 400 and the injectors 500. The fuel from unfiltered portion 200a flows via the by the filter 203 and the filtered fuel enters into the filtered portion 200b. the source refers to the reservoir of fuel from where the fuel is filled into the fuel tank 200.

[0010] In the fuel tank 200, the fuel from filtered portion 200b flows to the pump 300 via said outlet 202 of the fuel tank 200. From the inlet 201, the fuel flows into the fuel tank 200 to the unfiltered portion 200a and then after filtering from the filter 203, the fuel enters the filtered portion 200b and flows to the outlet 202 of the fuel tank 200.

[0010] According to an embodiment of the disclosure, the filter 203 comprises a filter element 203a and at least one mesh 203b surrounding the filter element 203a from each side. Here the filter element 203a is capable of filtering the fuel and to remove foreign particles and the impurities from the fuel and not limited to any particular kind of filter 203. The mesh 203b is placed around the filter element 203 and considered as the first level of filtration to remove the foreign particles from the fuel.

[0011] According to an embodiment of the disclosure, the filter 203 is positioned inside the fuel tank 200 by a means 204. The means 204 here refers to any mechanism for example locking mechanism that is used to locate or position the filter 203 into the fuel tank 200. The positioning of filter 203 in the fuel tank 200 is at one location in a way such that the filter divides the fuel tank 200 into filtered portion 200b and unfiltered portion 200a.

[0012] According to an embodiment of the disclosure, the filter 203 is positioned inside the fuel tank 200 by a snap fit. The snap fit is a locking means used to attach parts for a final product by pushing the parts interlocking components together.

[0013] In the fuel tank 200, a sealing element 205 is adapted to seal the filter 203 from both ends. For example, a flat seal ring is used to seal the filter 203 from both sides to the fuel tank 200. Here the sealing element 205 is not restricted to seal rings only but to any component used to seal an opening.

[0014] By using this filter 203 inside the fuel tank 200, an additional fuel filter outside the fuel tank 200 is eliminated. The mesh 203b surrounding the filter element 203a of the filter 203 increases the life and strength of the filter element 203a. The filter 203 inside the fuel tank 200 is serviced easily as it is assembled by a snap fit method. The sealing element 205 of the filter 203 from both ends inside the fuel tank 200 ensures the separation of the unfiltered and the filtered fuel.

[0014] ‘Adapted’ or ‘arranged’, in the context of the instant disclosure, refers to the technical capability or the technical capacity of a component, in relation to which the term ‘adapted’ or ‘arranged’ is used, to carry out or executed a specified action or actions, upon the requirement of the specified action or actions to be carried out or executed. Moreover, the usage of the term ‘adapted’ or ‘arranged’ here, is in reference with the normal technical capability or technical capacity of the component, imparted by the design or the structure or the composition of the component, and not in reference with any special or extraneous capability or capacity, beyond the scope of the normal technical capability or technical capacity. Therefore, there is a need to address this problem

[0015] It should be understood that embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.