Patent ID: 11898515
Assignee: FORD GLOBAL TECHNOLOGIES, LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 13:
14. A vehicle system, comprising:
a vehicle engine fuel system including a low-pressure fuel pump, a high-pressure fuel pump, and a fuel filter; and
a control system with instructions therein configured for, when executed, indicating degradation of each of the low-pressure fuel pump and the fuel filter based on a comparison between a pressure differential and a demanded fuel flow to an engine, the indication distinguishing between low-pressure fuel pump degradation and filter degradation, the pressure differential being a difference between a pressure setting at an inlet of a high-pressure pump and an actual pressure of the high-pressure pump,
wherein the demanded fuel flow to the engine is a flow of fuel estimated to maintain the pressure setting at the inlet of the high-pressure pump,
wherein the actual pressure is measured by a high-pressure pump pressure and temperature sensor coupled to the high-pressure pump.