System and method for oil supply to pump

A system for a high pressure fuel pump (HPFP), the system comprising:

• a gear enclosing a gear hub;
• a drive shaft meshed within the gear hub;
• one or more bushings at interfaces of the gear hub and an end cover of the HPFP;
• and
• a passage in the end cover of the HPFP for supplying pressurized lubricating oil to the gear, the gear hub, the one or more bushings, and the drive shaft, the passage continuing around the gear from a first side of the gear hub to a second side of the gear hub.

A system for a high-pressure fuel pump (HPFP) coupled to an engine fuel system, the system comprising:

• a controller with computer readable instructions stored on non-transitory memory that when executed during an engine-off condition cause the controller to:
• flow pressurized lubricating oil from an oil inlet to a gear hub, a gear, a thrust face, a bushing, and a drive shaft of the HPFP through a first portion of a first vertical channel;
• flow the pressurized lubricating oil from the oil inlet to a third vertical channel via a second portion of the first vertical channel and a second horizontal channel;
• and
• flow the pressurized lubricating oil to the gear, the gear hub, another thrust face, an end cover, and another bushing from the third vertical channel via a bore in the end cover of the HPFP, the bore intersecting with the third vertical channel.