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

Claim 0:
1. A method for a vehicle engine fuel system diagnoses, comprising:
indicating degradation of each of a low-pressure fuel pump and a 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,
the demanded fuel flow to the engine being a flow of fuel estimated to maintain the pressure setting at the inlet of the high-pressure pump, and
wherein the actual pressure is measured by a high-pressure pump pressure and temperature sensor coupled to the high-pressure pump.