Self-contained electric fuel pump with output pressure regulation

A self-contained electric fuel pump which includes a pair of coaxially spaced end caps and a case joining said end caps to form a pump housing, fuel inlet means in one of said end caps and fuel outlet means in the other of said end caps, a d.c. motor including an armature journaled for rotation within said housing, means coupled to said armature for pumping fuel through said housing from said inlet means to said outlet means such that fuel within said housing surrounding said armature is at substantially outlet pressure, and means for applying electrical power to said armature,

• characterized in that said power-applying means comprises a bore in said other end cap having an axial end opening into said housing and an axis parallel to and radially offset from axis of rotation of said armature, a piston of magnetic construction slidable in said bore as a function of pressure of fuel within said housing, a spring base at an end of said bore remote from said armature and a coil spring captured within said bore between said piston and said spring base, and means responsive to varying magnetic fields as a function of position of said piston within said bore for applying electrical power to said armature as a function of fuel pressure within said housing.