(57) A fuel pump assembly for use in an engine, the fuel pump assembly comprising a plurality
of pump heads (13a, 13b, 13c) mounted upon a main pump housing (10), wherein each
of the pump heads (13a, 13b, 13c) includes a pumping plunger (14) which is reciprocable,
in use, within a plunger bore (16) under the influence of an associated drive arrangement
(24, 26) so as to cause pressurisation of fuel within a pumping chamber (22) defined
within a pump head housing (18a). The drive arrangement of each pump head includes
a shoe (24) and a roller (26) which is cooperable with a driven cam (28), common to
each of the pump heads (13a, 13b, 13c), so as to impart reciprocal movement to the
shoe (24) as the cam (28) is driven, in use. The shoe (24) is of substantially square
or rectangular cross section an each pump head further includes an insert (30a) being
formed as a separate part from the main pump housing (10) but being in permanent attachment
therewith, wherein the insert (30a) defines a guide path of substantially rectangular
or square cross section corresponding to that of the shoe (24) so that the guide path
serves to guide movement of the shoe (24) upon reciprocal movement thereof.
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