An electric motor provides a carbon contact member of a commutator from
colliding with a brush holder. A projection is formed in the brush holder
so that it projects toward an end face of a resin mold of an armature. An
end face of this projection, which is opposed to the end face of the resin
mold of the armature, is positioned in the axial direction so as to form a
clearance between the contact members and the brush holder when the
armature is moved toward the brush holder by an external force and the end
face comes in contact with the end face. As a result, if shock is applied
to the fuel pump and the armature moves toward the brush holder, the
contact members of the commutator are prevented from colliding with the
brush holder. It thereby becomes possible to prevent the carbon contact
members from being damaged.
