Fuel systems.

摘要

A pump/injector includes a high pressure pump (10) which delivers fuel to an inwardly opening fuel injection nozzle (14). Also provided is a spill valve (20) which is connected to the pumping chamber (13) of the pump and through which the pumping chamber is filled with fuel from a source (29) by way of a first non-return valve (28). Connected intermediate the spill valve and the non-return valve is a branch passage to the spring chamber (18) of the nozzle and the pressure in the spring chamber when the spill valve is opened to terminate delivery of fuel is controlled by a valve (30).