Method and apparatus for determining the extent of wear of a fuel pump forming part of a fuelling system

摘要

A method for monitoring the extent of wear a fuel pump (40) forming part of a fuelling system for an engine (45), comprising the steps of delivering fuel from the fuel pump (40) to a metering valve arrangement (44) for regulating fuel flow from the pump to the engine, regulating the pressure drop across the metering valve arrangement (44) by means of a spill valve arrangement (52) comprising a spill valve member (53), monitoring the position of the spill valve member (53) so as to enable the fuel flow delivered by the pump (40) to be determined, and using the measured pump delivery flow to provide an indication of fuel leakage from the pump (40).;The invention also relates to an apparatus for performing the method of the present invention.