ROLLER FOR FUEL PUMP ACTUATOR

A roller (120) for a mechanical fuel pump assembly includes an elongate body. The elongate body defines an effective length (L1) that is less than its overall length (L). The elongate body defines a uniform circular cross section over a second length (L2) of the elongate body. The second length (L2) is 75 to 90 percent of the effective length (L1) and the second length (L2) extends between a first plane (A) and a second plane (A'). A first area of reduced cross section extends axially outward from the first plane (A) to a third plane (B) located axially inward of the first axial end; and a second area of reduced cross section extends axially outward from the second plane (A') to a fourth plane (B') located axially inward of the second axial end.