Patent ID: 6328538
Filing Date: 2001-12-11
Classification: F04D

Abstract:
An integrated electrically driven fuel pump comprising:an electric motor rotor having a shaft supporting a commutator;an integrated pump housing having an upper motor space for at least partially surrounding said electric motor commutator and at least one brush access aperture in communication with said upper motor space, and an impeller space in communication with a pump inlet and a pump outlet, and an opening between said upper motor space and said impeller space for closely accommodating said shaft; and an inlet side return bore having a first end in communication with said pump inlet and a second end opening to an exterior surface of said integrated pump housing, and an outlet side return bore having a first end in communication with said pump outlet and a second end opening to said exterior surface of said integrated pump housing, and further comprising a bypass/return structure having a flow bore having a first open end alignable with said second end of said outlet side return bore and a second open fitting end, and an abbreviated length flow bore having a first end in communication with said flow bore and a second open. end alignable with said second end of said outlet side return bore, said bypass/return structure sealably attachable to said exterior surface of said integrated pump housing; and wherein said second end of said inlet side return bore has a chamfer adjacent said second end opening to said exterior surface of said integrated pump housing to accommodate a head of a plug fittable at least partially into said inlet side return bore for disabling return of fluid back to said pump inlet; andan impeller carried by said shaft within said impeller space.