Fuel pump

A fuel pump comprising a plunger member reciprocable within a plunger bore, the plunger member being cooperable with a drive arrangement to cause inward movement of the plunger member within the plunger bore to increase fuel pressure therein, the pump further comprising an accumulator for fuel, the accumulator having an accumulator housing defining an accumulator chamber, and a valve arrangement controlling communication between the plunger bore and the accumulator to permit fuel under pressure to flow into the accumulator, wherein the accumulator housing is engageable with a seating surface defined by a seating member, the accumulator housing and the seating member being arranged such that the accumulator housing disengages the seating surface, in use, when the pressure of fuel within the accumulator chamber exceeds a predetermined amount, so as to relieve fuel pressure within the accumulator chamber, and wherein the pumping plunger is moved in an outward direction under the action of the fuel pressure within the accumulator.