Claims:We Claim:

1. A priming component (101) for a fuel filter head (100), the priming component (101) placed between a housing (103) and a top cover (102) in the operative configuration of the filter, where the housing (103) comprises a groove (104) and at least a flange (105) with threaded holes, where the top cover (102) is attached to the housing (103) by a screw (106) tightened with the threaded hole in the operative configuration of the filter.
2. The priming component (101) for a fuel filter head (100) as claimed in claim 1, where the priming component (101) is made of an elastomer.
, 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 disclosure relates to a priming component for a fuel filter head.

Background of the invention
[0002] Fuel Pumps used in vehicles are of two types either pressurized system or a suction system. A system layout having the fuel pump located prior to the filter serves to be a pressurized system whereas if the pump located successive to the filter it serves to be a suction system. In a suction system air pockets are formed due to the infusion of air to the fuel line between the filter and fuel tank. These intrusive air pockets causes an impulsive pressure drop and leading to a loss of continuous fuel flow to the filter, this eventually leads to vehicle level problems like vehicle coming to a sudden halt, startability problem. To eliminate this problem fuel filters are provided with a primer assembly. This primer design is an assembly of multiple components namely elastomer, aluminum die casted part, sheet metal parts, compression spring, oval heads screws and a machined part. There is a need to reduce the number of components and overall assembly cost.

[0003] Patent Document US4956081 A- Fuel filter with diaphragm pump discloses a fuel conditioner unit for an internal combustion engine, having a priming pump in which the pump diaphragm member also functions as the pump manual actuating surface. The diaphragm is mounted to the basin portion of the priming pump, so that it has a convex projecting surface adapted to be pushed by the user. A spring associated with the basin, biases the diaphragm outwardly so that it can recover after each downward push by the user. The priming pump basin, suction and discharge legs are preferably integrally formed at the upper portion of the unit frame or base. The frame is made of molded plastic such that an opening or archway is formed between the suction and discharge legs. The plastic frame is sandwiched between the filter housing and a steel bracket, with spring clips passing from the bracket through the archway and into retaining engagement with the housing. The anchor points on the bracket and the housing do not stress the plastic frame.

Brief description of the accompanying drawings
[0004] An embodiment of the invention is described with reference to the following accompanying drawings:
[0005] Fig. 1 depicts a primer assembly (100) for a fuel filter head.

Detailed description of the drawings
[0006] Figure 1 depicts a primer assembly (100) for a fuel filter head. A priming component (101) is placed between a housing (103) and a top cover (102) in the operative configuration of the filter. The housing (103) comprises a groove (104) and at least a flange (105) with threaded holes. The top cover (102) is attached to the housing (103) by a screw (106) tightened with the threaded hole in the operative configuration of the filter. The priming component (101) for a fuel filter head (100) is made of an elastomer. In an embodiment the filter head further comprises a cap (108) and at least a spring (107). The spring (107) is placed between the top cover (102) and the cap (108). The cap (108) is tightened on to the top cover (102) using another screw in the operative configuration of the filter.

[0007] Any vehicle layout is basically configured to have either pressurized system or a suction system. The deciding factor being the position of the electric feed pump. A system layout having the feed pump located prior to the filter serves to be a pressurized system whereas if the pump is located successive to the filter it serves to be a suction system. In the normal course of operation of a filter it is often seen that there is an air blockage which hampers the fuel entry from fuel tank to filter. Hence there is a need for a primer assembly (100). The primer assembly (100) removes this air blockage. This operation of removing the air blockage is known as priming. In the present disclosure as claimed above filter is primed by pushing the priming component (101) downwards, creating a high pressure which moves the causing trapped air to be expelled. The tightening of the cap (108) onto the top cover (102) by means of spring (107) causes the spring (107) to go in a compressed state. In the compressed state, the spring (107) creates a downward force of the priming component (101). Since the priming component (101) it made of an elastomer, it causes the priming component (101) to be flexed downwards. The flexing action establishes a vacuum action leading to a suction of the fuel from the inlet line, thereby removing the air blockage.

[0008] An additional passive function of the priming component (101) made up of an elastomer is to serve as a sealing between the top cover (102) and filter head. It serves as a barrier preventing the fuel sucked from leaking to the outside environment. The priming component (101) is made of an elastomer having a suitable binding force to withstand the normal wear and tear of the filter in the operative configuration. Material used for the construction of the priming component (101) can be but is not limited to hydrogenated nitrile butadiene rubber (HNBR).

[0009] This idea to develop a priming component (101) for a fuel filter head (100) will mitigate the cost of the priming component (101). In conventional fuel filters the priming assembly of the fuel filter head (100) comprises at least eight components. In the invention claimed above whole design of the priming assembly has been modified with an intent to reduce the number of components and overall assembly cost. Further the use of the elastomer as the priming component (101) provides the priming assembly with a robust primer which is able to resist the wear and tear during the priming function.

[0010] It must be understood that the embodiments explained in the above detailed description are only illustrative and do not limit the scope of this invention. Any modifications to the priming component (101) for a fuel filter head (100) are envisaged and form a part of this invention. The scope of this invention is limited only by the claims.