Abstract: A fuel injector has a circular plate like valve member (31) urged into engagement with an annular seating element (29) formed on the face of a seat member (23) in a closed position. A discharge orifice (28) is formed in the seat member through which fuel can flow when the valve member is lifted from the seating element (29) into an open position by magnetic forces produced by energizing a solenoid winding (17). The valve member is located within an annular spacer member (22) and a recess is formed in the face of the valve member remote from the seating element in which is located one end of a coiled compression spring (33). The base wall (35) of the recess is inclined at an angle between 6.degree. and 16.degree. with respect to the opposite surface of the valve member engageable with the seating element and is engaged by the spring so that a lateral force is applied to the valve member to urge it into engagement with the inner wall of the spacer member.