An apparatus for determining the status of a shut-off valve arrangement (28) forming part of a fuelling system of an engine comprises a metering valve arrangement (24) comprising a metering valve member (32) for regulating fuel flow from a pump (16) formin...

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...

An apparatus for supplying and controlling electrical power having a power source (3) for supplying electrical power to a primary load (4) and a secondary load (6, 7, 8) a capacitor (12) connected to an input (11) to the secondary load (6, 7, 8) and contro...