Pump head for a fuel pump

A pump head for a fuel pump for use in a common rail fuel injection system is provided. The pump head (300) comprises a pump head housing (302), a pumping chamber (306) defined within the pump head housing (302), and an inlet valve arrangement (308) for controlling fuel flow into the pumping chamber (306), the inlet valve arrangement (308) including an inlet valve member (310) moveable between open and closed positions wherein, in use, movement of the inlet valve member (310) is damped by means of viscoelastic damping.