Claims:We Claim:

1. A high pressure fuel pump (10), said high pressure fuel pump (10) comprising:
a housing (12); characterized in that
a fuel control unit (14) integrated with said high pressure fuel pump (10) such that said fuel control unit (14) is secured to said housing (12) of said high pressure fuel pump (10).

2. The high pressure fuel pump (10) in accordance with Claim 1 wherein said fuel control unit (14) is secured downstream from said housing (12) of said high pressure fuel pump (10), said fuel control unit (14) adapted to receive fuel that is delivered by said housing (12) of said high pressure fuel pump (10).

3. The high pressure fuel pump (10) in accordance with Claim 1 wherein said high pressure fuel pump (10) is coupled downstream from a low pressure fuel pump, said high pressure fuel pump (10) adapted to receive fuel that is supplied from said low pressure fuel pump.

4. The high pressure fuel pump (10) in accordance with Claim 1 wherein a first fuel passageway (16) is defined from an inlet of said high pressure fuel pump (10) around a circumference of said high pressure fuel pump (10), said first fuel passageway (16) adapted to channel fuel around said circumference of said high pressure fuel pump (10) to facilitate cooling said housing (12) of said high pressure fuel pump (10), said first fuel passageway (16) further adapted to channel fuel to an outlet (18) of said high pressure fuel pump (10).

5. The high pressure fuel pump (10) in accordance with Claim 4 further comprising a second fuel passageway defined from said first fuel passageway (16) to said fuel control unit (14), said second fuel passageway adapted to supply fuel from said first fuel passageway (16) to said fuel control unit (14).

6. The high pressure fuel pump (10) in accordance with Claim 5 further comprising a third fuel passageway defined from said fuel control unit (14) to a pumping chamber of said high pressure fuel pump (10), said third fuel passageway adapted to supply pressurized fuel from said fuel control unit (14) to said pumping chamber of said high pressure fuel pump (10).
, Description:Field of the invention
[0001] This invention relates to a fuel control unit and more particularly to a fuel control unit integrated with a high pressure fuel pump.

Background of the invention
[0002] US 2818111 A describes a carburetor including a housing having a fuel inlet therein, a float valve for controlling flow of fuel through said fuel inlet, a fuel control unit spaced from said carburetor, a fuel pump spaced from said fuel control unit, a first T-fitting adapted to be connected to a source of supply of fuel and said T-fitting having a branch line connected to said pump, a second T-fitting having a branch line connected to the fuel inlet of said carburetor, a conduit connecting said first and second fittings together, a conduit extending from said second fitting to said fuel control unit and having a manually operable valve therein, said fuel control unit including a casing, a cover detachably mounted on top of said casing, a conduit extending from said casing to said carburetor, said fuel control unit further including a bushing having a passageway therein, a needle valve for controlling flow of fluid through said passageway, a float for controlling said needle valve, and a conduit interconnecting said passageway to said first fitting.

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] Figure 1 illustrates a schematic diagram of a high pressure fuel pump used in combination with a fuel control unit.

Detailed description of the embodiments
[0005] A high pressure fuel pump 10 is described. The high pressure fuel pump 10 comprises a housing 12 and a fuel control unit 14 integrated with the high pressure fuel pump 10 such that the fuel control unit 14 is secured to the housing 12 of the high pressure fuel pump 10.
[0006] Figure 1 illustrates a schematic diagram of a high pressure fuel pump 10 used in combination with a fuel control unit 14. The high pressure fuel pump 10 includes a housing 12. A fuel control unit 14 is integrated in the high pressure fuel pump 10. More specifically, the fuel control unit 14 is integrated in the high pressure fuel pump 10 such that the fuel control unit 14 is secured to the housing 12 of the high pressure fuel pump 10. The fuel control unit 14 is secured to the housing 12 of the high pressure fuel pump 10 such that the fuel control unit 14 forms an integrated assembly with the housing 12 of the high pressure fuel pump 10.
[0007] The housing 12 of the high pressure fuel pump 10 comprises a first fuel passageway 16. The first fuel passageway 16 is secured to the housing 12 of the high pressure fuel pump 10 such that fuel is channelled within the housing 12 of the high pressure fuel pump 10 via the first fuel passageway 16 in order to facilitate cooling the housing 12 of the high pressure fuel pump 10. The first fuel passageway 16 circumscribes around the housing 12 of the high pressure fuel pump 10 such that the fuel that is channelled through the first fuel passageway 16 is used to cool the entire portion of the housing 12 of the high pressure fuel pump 10.
[0008] The first fuel passageway 16 extends into the fuel control unit 14 such that the first fuel passageway 16 is secured to the housing of the fuel control unit 14. From the fuel control unit 14, a portion of the fuel is channelled back to the fuel tank via the outlet 18 of the high pressure fuel pump 10. From the first fuel passageway 16 that is secured to the fuel control unit 14, the remaining portion of metered fuel that is not channelled to the outlet 18 of the high pressure fuel pump 10 is channelled to the fuel control unit 14 via a second fuel passageway that is in flow communication with the first fuel passageway 16. From the fuel control unit 14, a metered quantity of fuel is channelled to the pumping chamber of the high pressure fuel pump 10 from where it is compressed and delivered to a fuel injector.
[0009] A working of the high pressure fuel pump 10 is described as an example. Fuel is channeled from the low pressure fuel pump to the first fuel passageway 16 of the high pressure fuel pump 10. From the first fuel passageway 16, the pressurized fuel is supplied through the housing 12 of the high pressure fuel pump 10 where it is used to cool the housing 12 of the high pressure fuel pump 10. From the housing 12 of the high pressure fuel pump 10, the heated pressurized fuel is channeled to the outlet 18 of the high pressure fuel pump 10. The portion of the heated pressurized fuel that is channeled to the outlet 18 of the high pressure fuel pump 10 is delivered back to the fuel tank. The remaining portion of the heated pressurized fuel is channeled to the fuel control unit 14. The fuel control unit 14 comprises a traditional solenoid valve that allows the pressurized fuel to be metered and delivered to the pumping chamber of the high pressure fuel pump 10.

[0010] The fuel control unit 14 that is integrated with the housing 12 of the high pressure fuel pump 10 allows for fuel to be channeled through the fuel passageway 16, cool the housing 12 of the high pressure fuel pump 10, and then flow to the fuel control unit 14. As the fuel control unit 14 is downstream from the housing 12 of the high pressure fuel pump 10, the quantity of fuel that is channeled into the housing 12 of the high pressure fuel pump 10 can be higher than the quantity of fuel that is channeled to the fuel control unit 14, while the remaining fuel is discharged from the outlet 18 back to the fuel tank.
[0011] It must be understood that the embodiments explained in the above detailed description is only illustrative and does not limit the scope of this invention. The scope of this invention is limited only by the scope of the claims. Many modifications and changes in the embodiments aforementioned are envisaged and are within the scope of this invention.