Abstract: An internal combustion engine (200) includes a fluid pump (220) having an inlet (218), a low pressure outlet (223), and a high pressure outlet (222). A reservoir (226) is connected to the high pressure outlet (222) and an oil sump (204) is in fluid communication with the inlet (218). A pressure regulating valve (228) connects the high pressure outlet (222) and the low pressure outlet (223). A recirculation passage (227) fluidly connects the low pressure outlet (223) with the inlet (218). A flow of oil at a high pressure in the high pressure outlet (222) passes through the regulating valve (228) and enters the inlet (218) when the fluid pump (220) is in operation.

Abstract: A high pressure fluid system (100) for an engine includes a high pressure reservoir (110) and a high pressure pump (116) fluidly connected to the high pressure reservoir (110). The high pressure pump (116) circulates fluid to the high pressure reservoir (110) and has and inlet throttle (114) arranged and constructed to control fluid flow rate at an inlet of the high pressure pump (116). A low pressure pump (102) is fluidly connected to the inlet throttle (114) and circulates the fluid from a low pressure reservoir (104) to the inlet throttle (114).