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A turbine fuel supply system is disclosed as including a first sub-system having: a first nozzle for injecting fuel into a combustor of a turbine engine; a first valve controllable to communicate fuel to the first nozzle; and a first fuel manifold for communicating fuel to the first valve from a fue

A turbine fuel supply system is disclosed as including a first sub-system having: a first nozzle for injecting fuel into a combustor of a turbine engine; a first valve controllable to communicate fuel to the first nozzle; and a first fuel manifold for communicating fuel to the first valve from a fuel source; the system further including a controller assembly for raising the pressure of fuel in the first fuel manifold; and the system being characterized in that the first valve is adapted to open in response to a predetermined pressure difference between the first fuel manifold and the pressure in the combustor, thereby allowing fuel to be communicated from the first fuel manifold to the first nozzle. The system may include a first recirculating conduit in fluid communication with the first fuel manifold and the fuel source, the first recirculating conduit allowing fuel not communicated by the first valve to be returned to the fuel source.

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1. A turbine fuel supply system including a first sub-system having: a first nozzle for injecting fuel into a combustor of a turbine engine;a first valve controllable to communicate fuel to the first nozzle;a first fuel manifold for communicating fuel to the first valve from a fuel source; anda firs

1. A turbine fuel supply system including a first sub-system having: a first nozzle for injecting fuel into a combustor of a turbine engine;a first valve controllable to communicate fuel to the first nozzle;a first fuel manifold for communicating fuel to the first valve from a fuel source; anda first recirculating conduit in fluid communication with the first fuel manifold and the fuel source, the first recirculating conduit allowing fuel not communicated by the first valve to be returned to the fuel source,wherein the first recirculating conduit is located downstream from the first valve,the system further including a controller assembly for raising the pressure of fuel in the first fuel manifold; and the system being characterized in thatthe first valve is adapted to open in direct response to a crack pressure predetermined by a pressure difference between a varying pressure in the first fuel manifold and the pressure in the combustor, thereby allowing fuel to be communicated from the first fuel manifold to the first nozzle. 2. A turbine fuel supply system according to claim 1, further including a second sub-system having: a second nozzle for injecting fuel into the combustor of the turbine engine;a second valve controllable to communicate fuel to the second nozzle; anda second fuel manifold for communicating fuel to the second valve from the fuel source; whereinthe controller assembly is capable of raising the pressure of fuel in the second fuel manifold; and whereinthe second valve is adapted to open in direct response to a crack pressure predetermined by a pressure difference between a varying pressure in the second fuel manifold and the pressure in the combustor, thereby allowing fuel to be communicated from the second fuel manifold to the second nozzle. 3. A turbine fuel supply system according to claim 2, further including a second recirculating conduit in fluid communication with the second fuel manifold and the fuel source, the second recirculating conduit allowing fuel not communicated by the second valve to be returned to the fuel source. 4. A turbine fuel supply system according to claim 2 further including: a second recirculating conduit in fluid communication with the second fuel manifold and the fuel source, the second recirculating conduit allowing fuel not communicated by the second valve to be returned to the fuel source;wherein the first recirculating conduit is in fluid communication with the fuel source via the second recirculating conduit. 5. A turbine fuel supply system according claim 4, wherein the second fuel manifold includes the first fuel manifold and the first recirculating conduit. 6. A turbine fuel supply system according claim 4, further including a primary sub-system having: a primary nozzle for injecting fuel into the combustor of the turbine engine;a primary valve controllable to communicate fuel to the primary nozzle; anda primary fuel manifold for communicating fuel to the primary valve from the fuel source; whereinthe controller assembly is capable of raising the pressure of fuel in the primary fuel manifold; and whereinthe primary valve is adapted to open in direct response to a predetermined pressure difference between the primary fuel manifold and the pressure in the combustor, thereby allowing fuel to be communicated from the primary fuel manifold to the primary nozzle. 7. A turbine fuel supply system according to claim 6, further including: a primary recirculating conduit in fluid communication with the primary fuel manifold and the fuel source, the primary recirculating conduit allowing fuel not communicated by the primary valve to be returned to the fuel source;wherein the primary recirculating conduit is in fluid communication with the fuel source via a sequence of the first and second recirculating conduits. 8. A turbine fuel supply system according to claim 7 wherein the first fuel manifold includes the primary fuel manifold and the primary recirculating conduit. 9. A turbine fuel supply system according to claim 4, wherein the first recirculating conduit puts the first fuel manifold in fluid communication with the second fuel manifold. 10. A turbine fuel supply system according to claim 4 further including a flow regulator for maintaining a set flow rate for the recirculated fuel. 11. A turbine fuel supply system according to claim 4, further including a second flow meter for determining the rate of flow of fuel in the first manifold or the second manifold or both. 12. A turbine fuel supply system according to claim 11 wherein the second flow meter determines the fuel flow rate in the respective manifold of each staged sub-system only. 13. A turbine fuel supply system according to claim 6, wherein said primary nozzle forms a portion of a pilot stage of the system. 14. A turbine fuel supply system according to claim 2, wherein said second nozzle forms a portion of a second mains stage of the system. 15. A turbine fuel supply system according to claim 1 further including a measurement assembly for determining the flow rate of fuel communicated to the fuel manifold of the staged-in sub-system. 16. A turbine fuel supply system according to claim 1, wherein the first recirculating conduit includes a restrictor for restricting fuel flow. 17. A turbine fuel supply system according to claim 1, further including a first meter for determining the rate of flow of fuel returned to the fuel source. 18. A turbine fuel supply system according to claim 1, wherein the first recirculating conduit includes a non-return valve. 19. A turbine fuel supply system according to claim 1, further including a drain conduit for communicating, in response to a shutdown of the turbine, fuel from the fuel manifold to a drains tank. 20. A turbine fuel supply system according to claim 1, wherein said first nozzle forms a portion of a first mains stage of the system. 21. A turbine engine including the turbine fuel supply system according to claim 1. 22. An aeroplane including the turbine fuel supply system according to claim 1.