Claims:We claim:
1. An inlet connector (106) for a high pressure pump (102), said inlet connector (106) fluidly couples said high pressure pump (102) to a low pressure pump, said inlet connector (106) comprising:
a throttle path (110) perpendicular to an inlet path (108), said throttle path (110) connects to a fuel tank, characterized in that
a diameter of said throttle path (110) is 0.4 mm when said low pressure pump is a mechanical feed pump.

2. The inlet connector (106) as claimed in claim 1, wherein said high pressure pump (102) is a single cylinder pump.
, 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 present invention relates to an inlet connector for a high pressure pump.

Background of the invention:
[0002] When a high pressure pump having an inlet connector with a throttle path also called as a Zero Delivery Throttle (ZDT) of size 0.6 mm is used on an engine with an electrical feed pump, it is able to meet the minimum delivery as per system requirement at engine start condition. However, when the same high pressure pump having an inlet connector with the throttle path of size of 0.6mm is used on engine with a mechanical feed pump system, delivery requirement at start condition fails or is not met. At start speed, due to speed dependent delivery by mechanical gear pump, the delivery is already low at start speed. Now due to the leakage at throttle path of size 0.6 mm, the quantity reaching inlet of the high pressure pump for pressurizing is further reduced. This is because of excess leakage from the throttle path flows out through a banjo into the fuel tank. This leads to lower filling of high pressure pump and consequently lower delivery to the engine. The pressurized low quantity from the high pressure pump is not sufficient to start the engine.

[0003] Hence, there is a need for a solution to enable the working of the mechanical feed pump with the high pressure pump.

Brief description of the accompanying drawings:
[0004] An embodiment of the disclosure is described with reference to the following accompanying drawing,
[0005] Fig. 1 illustrates an inlet connector of a high pressure pump, according to an embodiment of the present invention.

Detailed description of the embodiments:
[0006] Fig. 1 illustrates an inlet connector of a high pressure pump, according to an embodiment of the present invention. The inlet connector 106 fluidly couples the high pressure pump 102 to a low pressure pump. The inlet connector 106 comprising a throttle path 110 also called as the Zero Delivery Throttle (ZDT) path. The throttle path 110 is perpendicular to an inlet path 108. The throttle path 110 connects to a fuel tank through a banjo 104. The inlet connector 106 is characterized by, the diameter of the throttle path 110 is 0.4 mm when the low pressure pump is a mechanical feed pump (not shown). The mechanical feed pump is connectable to the free end of the inlet connector 106. In an embodiment, the high pressure pump 102 is a single cylinder pump also known as PF pump.

[0007] The reduction of the diameter of the throttle path 110 from 0.6 mm to 0.4 mm in pump inlet in the high pressure pump 102 enables improved start-ability with mechanical feed pump and reduced diesel blackening. Further, an improvement in pump delivery rate during engine-start is achieved with mechanical feed pump system. Due to reduced size of the diameter, there is less leakage and more pump filling-in at start conditions, when the mechanical feed pump used with the high pressure pump 102. Further, there is considerable cost reduction with usage of mechanical feed pump instead of electric feed pump. Still further, the high pressure pump 102 is able to be used with any mechanical feed 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.