Claims:We Claim:
1. A fuel injection pump (100) comprising at least:
a housing (102) enclosing a plunger (104);
an inlet (106) to receive fuel from a fuel tank; characterized in that:
a cavity (108) located within said housing (102), said cavity (108) in flow communication with said inlet (106).

2. The fuel injection pump (100) of claim 1, wherein said cavity (108) is located opposite to said inlet (106).

3. The fuel injection pump (100) of claim 1, wherein said cavity 108 and said inlet 106 are located between 00 degree and 3600 with respect to the axis of said housing 102.
, Description:Field of the invention
[0001]This invention relates to the field of a fuel injection pump.

Background of the invention
[0002] A fuel injection pump is used to pressurize fuel before sending the pressurized fuel to a fuel injector. During suction stroke the fuel from a fuel tank reaches the fuel injection pump from through a pipe. A plunger in a fuel injection pump reciprocates within a housing. A throttling effect is created in the pipe during every suction stroke. In the existing fuel injection pump, a part of the fuel is stored in a separate cavity. The cavity is created by attaching a separate component on the housing. Since the housing is attached to the fuel injection pump, there is a chance for fuel to leak from the housing. Also, the housing adds to the overall dimension of the fuel injection pump. There is need to make fuel injection pump compact.

Brief description of the accompanying drawing
[0003] Different modes of the invention are disclosed in detail in the description and illustrated in the accompanying drawing:

[0004] FIG. 1 illustrates a fuel injection pump.

Detailed description of the embodiments
[0005] FIG. 1 illustrates a fuel injection pump 100. The fuel injection pump 100 comprises a housing 102 enclosing a plunger 104, an inlet 106 to receive fuel from a fuel tank. A cavity 108 located within the housing 102, the cavity 108 is in flow communication with the inlet 106. The cavity 108 is located opposite to the inlet 106.

[0006]The construction of the fuel injection pump 100 will be explained in further detail. The fuel injection pump 100 comprises a housing 102. The housing 102 encloses a plunger 104. The plunger 104 is driven by a rotating cam. The housing 102 comprises an inlet 106. A pipe connects the inlet 106 to the fuel tank. The cavity 108 is located within housing 102. The cavity 108 is located opposite to the inlet 106. In an embodiment the cavity 108 102 and the inlet 106 are located at between 00 degree and 3600 with respect to the axis of the housing 102.The cavity 108 may be located at any other location within the housing 102 with respect to the inlet 106 so as to receive fuel from the inlet 106. A part of the fuel that is received at the inlet 106 flows into the cavity 108 by flow around the valve 103. The fuel in the cavity 108 flows into the pressurizing chamber of the fuel injection pump 100.

[0007]The working of the fuel injection pump 100 will be explained in further detail. The fuel injection pump 100 is used to pressurize fuel that is received from a fuel tank. The fuel from the fuel tank flows through a pipe to reach the inlet 106. From the inlet 106 a part of the fuel flows around the valve to reach the cavity 108. The fuel is stored in the cavity 108 of the fuel injection pump 100. The inlet 106 is also in flow communication with the housing 102 that encloses the plunger 104. Hence, fuel from the inlet 106 reaches the housing 102 during suction stroke of the plunger 104. The fuel that is stored in the cavity 108 flows through the valve 103 and mixes with the fuel in the housing 102. This reduces the throttling effect of pipe, created during suction stroke of the plunger 104. Since the cavity 108 is a part of the housing 102 the need for a separate housing 102 that needs to be attached to the fuel injection pump 100 is not required. Hence the fuel that is stored in the casing during pressurization stroke of the fuel injection pump 100 is used during the next suction stroke of the fuel injection pump 100, this improves the filling effect of fuel in the fuel injection pump 100 thereby compensating for the throttling effect of the pipe that connects the fuel tank with the fuel injection pump.

[0008]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.