Liquid fuel injection pumping apparatus

Claim 1

A liquid fuel injection pumping apparatus for supplying fuel to an internal combustion engine and of the kind comprising a housing, an injection pump located within the housing and operable in timed relationship with the associated engine to supply fuel to the combustion spaces of the engine in turn, a feed pump in the housing for supplying fuel to the injection pump, the feed pump having an inlet port connected to a fuel inlet on the housing and an outlet through which fuel flows to the injection pump, said fuel inlet in use being connected to a fuel supply tank, a space defined within the housing and into which fuel leaking from the injection pump can flow, an outlet on said housing communicating with the fuel supply tank, means forming a chamber, a float within said chamber, and a float controlled valve, said float controlled valve controlling the flow of fuel from said chamber to the injection pump, an inlet to said chamber from the feed pump and an outlet from the upper part of said chamber said outlet including a restricted orifice, the arrangement being such that air flowing into said chamber can be discharged from the chamber by way of said restricted orifice but in the event that air tends to collect in the chamber, the float will be depressed to close said valve thereby to prevent the flow of air to the injection pump.