Monitoring equipment for monitoring the performance of an engine fuel injector valve

Monitoring equipment for monitoring the performance of an engine fuel injector valve comprising:

• a source of pressurized fluid and an injector valve head provided with a connector to enable an injector valve to be connected thereto, the head being connected to the source of pressurized fluid so that pressurized fluid is delivered to the injector valve when the equipment is in use, a regulator to compensate for changes in pressure of the fluid at the injector valve head owing to pulsed operation of the injector valve when the equipment is in use, as well as to enable a change in pressure to be effected and maintained at the injector valve head, and a flow monitor in the fluid path between the source of pressurizing fluid and the injector valve head to monitor the flow of fluid to the injector valve head, wherein the source of pressurized fluid is such as to maintain a level of pressure in excess of a desired operating pressure, and wherein the regulator includes a fluid flow control coupled to a pressure sensor, which is at the test head to provide an indication of the pressure therein so that the flow control effects an increase or a decrease to flow of fluid through the fluid path to maintain the pressure of the fluid at the injector valve head substantially at the desired operating pressure.