(57) A fuel system (10) arranged to deliver fuel at high pressure to a fuel injector through
a high pressure fuel line (42, 44) defined, at least in part, within first and second
housing parts (46, 40) of a pressure relief valve arrangement. The first and second
housing parts (46, 40) define first and second separable valve surfaces respectively.
A clamping means (46) is provided for applying a clamping load to the first and second
housing parts (46, 40) so as to urge first and second valve surfaces respectively
thereof into substantially sealing engagement. The clamping means is arranged to permit
separation of the first and second valve surfaces in the event that fuel pressure
within the high pressure fuel line (42, 44) exceeds a predetermined amount, thereby
to permit fuel within the high pressure fuel line (42, 44) to flow to a region (62)
of relatively low pressure to relieve fuel pressure within the high pressure fuel
line.
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