Patent ID: 6253741
Filing Date: 2001-07-03
Classification: F02B,F02D,F02M

Abstract:
A device for preventing fuel pump air ingestion in a diesel fuel system, the diesel fuel system comprising a diesel engine having a plurality of injectors, the injectors receiving a supply of diesel fuel from a fuel injection pump at a high pressure, the fuel injection pump receiving the supply of diesel fuel from a transfer pump at a transfer pressure through a transfer pressure gallery, the supply of diesel fuel stored in a fuel tank coupled to the transfer pump through a fuel line, the device for preventing fuel pump air ingestion comprising:a low pressure sensing switch coupled to said transfer pressure gallery and sensing said transfer pressure, whereby said transfer pressure drops below a predetermined pressure when a supply of air enters said transfer pump;a controller coupled to said low pressure sensing switch and said fuel injection pump, said controller disabling said fuel injection pump when said transfer pressure drops below said predetermined pressure, thereby preventing a supply of air from entering said fuel injection pump, said controller also reinstating operation of said fuel injection pump when said transfer pressure is above said predetermined pressure;a transfer pressure continuous bleed orifice located in said transfer pressure gallery, said transfer pressure continuous bleed orifice allowing said supply of air to escape from said transfer pressure gallery when said diesel engine is primed, wherein said transfer pressure continuous bleed orifice vents said supply of air into said fuel injection pump housing; anda housing continuous bleed orifice located in said fuel injection pump housing, said housing continuous bleed orifice allowing said supply of air to escape from said fuel injection pump housing when said diesel engine is primed.