The present invention discloses an anti-decompression gear fuel pump for broken bubbles, characterized by comprising: a drive motor; and a pump body and a pump cover successively installed on the top end of the drive motor, wherein the pump body is provided with a groove, and a driving gear, a left driven gear and a right driven gear which are installed in the groove and are linked through a motor shaft of the drive motor; meanwhile, the driving gear is respectively internally engaged with the left driven gear and the right driven gear; the pump cover is provided with an A end of a fuel outlet, a D end of a circulating fuel outlet, a B end of a circulating fuel inlet, and a C end of a fuel inlet; and the A end of the fuel outlet, the D end of the circulating fuel outlet, the B end of the circulating fuel inlet, and the C end of the fuel inlet are penetrated into the groove of the pump body. The anti-decompression gear fuel pump for broken bubbles, designed in the present invention, not only solves a decompression problem generated because bubbles appear in a fuel pipeline, but also has scientific and reasonable structure.

A high-pressure fuel pump includes a drive shaft, and a vane pump and a plunger pump which are driven by the drive shaft. The vane pump is configured to supply pre-pressurized fuel to the plunger pump. The drive shaft includes a cam configured to drive a piston rod of the plunger pump such that the plunger pump alternately executes a fuel suction stroke and a fuel discharge stroke. The drive shaft further includes a shaft portion for driving a rotor of the vane pump. The vane pump is configured such that for each fuel suction stroke of the plunger pump the vane pump provides a fuel supply cycle that is advanced by a phase angle relative to the fuel suction stroke.

A high-pressure fuel pump includes a drive shaft, and a vane pump and a plunger pump which are driven by the drive shaft. The vane pump is configured to supply pre-pressurized fuel to the plunger pump. The drive shaft includes a cam configured to drive a piston rod of the plunger pump such that the plunger pump alternately executes a fuel suction stroke and a fuel discharge stroke. The drive shaft further includes a shaft portion for driving a rotor of the vane pump. The vane pump is configured such that for each fuel suction stroke of the plunger pump the vane pump provides a fuel supply cycle that is advanced by a phase angle relative to the fuel suction stroke.

A method is provided for controlling operation of a fueling system including a fuel pump driven by an engine geartrain and a fuel accumulator supplied fuel by the fuel pump, comprising: determining whether an operating parameter of the engine is less than a threshold value; responding to the operating parameter being less than the threshold value by causing an inlet valve of the fuel pump to operate in a 100 percent fill mode, whereby a pumping chamber in the fuel pump is approximately fully filled for at least one pumping cycle; determining whether a fuel pressure in the fuel accumulator is greater than a desired value while the inlet valve is in the 100 percent fill mode; and responding to the fuel pressure being greater than the desired value by activating an outlet valve of the fuel accumulator to drain fuel in the fuel accumulator to a fuel tank.

A method is provided for controlling operation of a fueling system including a fuel pump driven by an engine geartrain and a fuel accumulator supplied fuel by the fuel pump, comprising: determining whether an operating parameter of the engine is less than a threshold value; responding to the operating parameter being less than the threshold value by causing an inlet valve of the fuel pump to operate in a 100 percent fill mode, whereby a pumping chamber in the fuel pump is approximately fully filled for at least one pumping cycle; determining whether a fuel pressure in the fuel accumulator is greater than a desired value while the inlet valve is in the 100 percent fill mode; and responding to the fuel pressure being greater than the desired value by activating an outlet valve of the fuel accumulator to drain fuel in the fuel accumulator to a fuel tank.

A high-pressure fuel pump includes a drive shaft, and a vane pump and a plunger pump which are driven by the drive shaft. The vane pump is configured to supply pre-pressurized fuel to the plunger pump. The drive shaft includes a cam configured to drive a piston rod of the plunger pump such that the plunger pump alternately executes a fuel suction stroke and a fuel discharge stroke. The drive shaft further includes a shaft portion for driving a rotor of the vane pump. The vane pump is configured such that for each fuel suction stroke of the plunger pump the vane pump provides a fuel supply cycle that is advanced by a phase angle relative to the fuel suction stroke.

A high-pressure fuel pump includes a drive shaft, and a vane pump and a plunger pump which are driven by the drive shaft. The vane pump is configured to supply pre-pressurized fuel to the plunger pump. The drive shaft includes a cam configured to drive a piston rod of the plunger pump such that the plunger pump alternately executes a fuel suction stroke and a fuel discharge stroke. The drive shaft further includes a shaft portion for driving a rotor of the vane pump. The vane pump is configured such that for each fuel suction stroke of the plunger pump the vane pump provides a fuel supply cycle that is advanced by a phase angle relative to the fuel suction stroke.

A method is provided for controlling operation of a fueling system including a fuel pump driven by an engine geartrain and a fuel accumulator supplied fuel by the fuel pump, comprising: determining whether an operating parameter of the engine is less than a threshold value; responding to the operating parameter being less than the threshold value by causing an inlet valve of the fuel pump to operate in a 100 percent fill mode, whereby a pumping chamber in the fuel pump is approximately fully filled for at least one pumping cycle; determining whether a fuel pressure in the fuel accumulator is greater than a desired value while the inlet valve is in the 100 percent fill mode; and responding to the fuel pressure being greater than the desired value by activating an outlet valve of the fuel accumulator to drain fuel in the fuel accumulator to a fuel tank.

A method is provided for controlling operation of a fueling system including a fuel pump driven by an engine geartrain and a fuel accumulator supplied fuel by the fuel pump, comprising: determining whether an operating parameter of the engine is less than a threshold value; responding to the operating parameter being less than the threshold value by causing an inlet valve of the fuel pump to operate in a 100 percent fill mode, whereby a pumping chamber in the fuel pump is approximately fully filled for at least one pumping cycle; determining whether a fuel pressure in the fuel accumulator is greater than a desired value while the inlet valve is in the 100 percent fill mode; and responding to the fuel pressure being greater than the desired value by activating an outlet valve of the fuel accumulator to drain fuel in the fuel accumulator to a fuel tank.

A priming pump may include a housing; an inlet passageway inside of the housing; an outlet passageway inside of the housing; a divider, inside of the housing, separating the inlet passageway and the outlet passageway; a connecting passageway through the divider in fluid communication with the inlet passageway and the outlet passageway; a valve, disposed in the connecting passageway, configured for one-way fluid flow from the inlet passageway to the outlet passageway; a rotary pump, inside of the housing, having an inlet in fluid communication with the inlet passageway and an outlet in fluid communication with the outlet passageway; and a shaft connected to the rotary pump and extending through the housing, the shaft configured for rotation by an external driving mechanism.