Patent ID: 8622722

Claim:
A fuel pump for an internal combustion engine, comprising: a housing; a pump accommodated within the housing; a motor accommodated within the housing, the motor comprising a wound stator having a plurality of inwardly directed teeth about which a stator winding is wound and at least one unwound tooth, and an outer surface in contact with an inner surface of the housing; and at least one pathway formed between the inner surface of the housing and the outer surface of the stator, for the flow of fuel there through, each pathway being formed by a recess formed in the outer surface of the stator, and the recess substantially extending in an axial direction of the motor, each recess being aligned with an unwound tooth of the stator, wherein the stator is over moulded with material, the material encases the stator winding to protect the stator winding from chemical reaction with the fuel, pole pieces of the stator are not covered by the material, and wherein a core of the stator comprises a plurality of laminations stacked together, each lamination defines a plurality of spaced cutouts in an outer circumference and forms a nub in each of the cutouts, the cutouts of the laminations are aligned axially, the nubs of the laminations are welded together to connect the laminations together, the material is filled in the cutouts to form a plurality of spaced strips to protect the weld, portions of the outer circumferences of the laminations between adjacent strips being not covered by the material.