<p>A fuel injection pump (100) comprises housing (101). An inlet valve body (102) is located in the housing (101). A hollow passage (103) accommodates a plunger (104). One end of the hollow passage (103) opens into and interfaces with the inlet valve body (102). A step (105) is provided at the interface between one end of the hollow passage (103) and the inlet valve body (102). The profile of the inlet valve body (102) is complementary to the step (105). The step (105) results in clearance between the housing (101) and the inlet valve body (102).</p>
