The disclosed lift pump employs a unique arrangement of conductive studs to transmit the three phases of motor power from the control board to the brushless motor. The conductive studs penetrate the wall of the motor/pump enclosure, which is otherwise non-conductive. The conductive studs are intentionally larger than needed to transmit the current used by the motor, and are arranged in thermal contact with heat conductive portions of the motor control board to transmit heat from the control board into the motor/pump enclosure where heat is transmitted to fuel passing through the assembly. An additional center heat sink is situated in a position aligned with heat generating capacitors that are part of the motor drive circuitry on the motor control board.

A fuel filter assembly incorporates a BLDC motor and control circuit configured to operate at a first rotational speed upon startup and switch to a second rotational speed when measured variables indicate that the filter assembly is filled with fuel. The first rotational speed is initiated as a default when power is applied to the control circuit. If the filter assembly has been serviced, it must be primed before resuming normal operation. The first rotational speed is significantly higher than the second rotational speed to reduce the amount of time necessary to prime the filter assembly. The control circuit is arranged to monitor a variable which corresponds to the torque necessary to drive the pump. When the pump is filled with air prior to priming, lower torque is required to drive the pump, which corresponds to lower current draw and power consumption at the BLDC motor.

A fuel filter assembly incorporates a BLDC motor and control circuit configured to operate at a first rotational speed upon startup and switch to a second rotational speed when measured variables indicate that the filter assembly is filled with fuel. The first rotational speed is initiated as a default when power is applied to the control circuit. If the filter assembly has been serviced, it must be primed before resuming normal operation. The first rotational speed is significantly higher than the second rotational speed to reduce the amount of time necessary to prime the filter assembly. The control circuit is arranged to monitor a variable which corresponds to the torque necessary to drive the pump. When the pump is filled with air prior to priming, lower torque is required to drive the pump, which corresponds to lower current draw and power consumption at the BLDC motor.

A pumping assembly to feed fuel, preferably diesel fuel, to an internal combustion engine is provided with an electric gear pump (7) having two gears (33, 37) mounted one inside the other, and of which one is an annular rotor (33) mounted rotatably on the inside of a stator (29) through the interposition of a support bearing (42), which is delimited by a substantially cylindrical side wall (43) having at least one strip (47) of elastically deformable material which is substantially parallel to a rotation axis (30) of said rotor (33).

A pumping assembly to feed fuel, preferably diesel fuel, to an internal combustion engine is provided with an electric gear pump (7) having two gears (33, 37) mounted one inside the other, and of which one is an annular rotor (33) mounted rotatably on the inside of a stator (29) through the interposition of a support bearing (42), which is delimited by a substantially cylindrical side wall (43) having at least one strip (47) of elastically deformable material which is substantially parallel to a rotation axis (30) of said rotor (33).

A method for controlling an electric motor of a vehicle pump used to deliver a medium. According to the method, a period required for at least one partial revolution of a rotor of the electric motor is determined. The fluctuations during the period can represent a measurement of the true running of the electric motor. The speed of the electric motor can be altered depending on the deviation of the period from a comparative value. As a result, the true running of the electric motor can be guaranteed once again.

A method for controlling an electric motor of a vehicle pump used to deliver a medium. According to the method, a period required for at least one partial revolution of a rotor of the electric motor is determined. The fluctuations during the period can represent a measurement of the true running of the electric motor. The speed of the electric motor can be altered depending on the deviation of the period from a comparative value. As a result, the true running of the electric motor can be guaranteed once again.

A fuel system is provided that includes a boost stage, a positive displacement pump and a first bypass valve configured to bypass fuel to one of the boost stage and the positive displacement pump. A second bypass valve is configured to bypass fuel to the other of boost stage and the positive displacement pump.

A fuel system is provided that includes a boost stage, a positive displacement pump and a first bypass valve configured to bypass fuel to one of the boost stage and the positive displacement pump. A second bypass valve is configured to bypass fuel to the other of boost stage and the positive displacement pump.

A fluid pump includes an inlet plate with an inlet; an outlet plate, the outlet plate having an outlet plate outlet passage; an outlet; an electric motor having a shaft which rotates; a pumping element coupled to the shaft such that rotation of the pumping element by the shaft causes fluid to be pumped from the inlet to the outlet, the inlet plate interfacing with the pumping element in an inlet sealing surface interface and the outlet plate interfacing with the pumping element in an outlet sealing surface interface; a purge passage which receives fluid from the outlet plate outlet passage, the purge passage being in fluid communication with the inlet sealing surface interface and the outlet sealing surface interface; and a filter downstream of the outlet plate outlet passage which filters fluid that passes through the purge passage prior to reaching the inlet and outlet sealing surface interfaces.