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A drain system and method for draining a first liquid, including a collection vessel having a first chamber arranged to receive the first liquid, a second chamber, and higher and lower valves positioned between the first and second chambers. When the valves are open, liquids can pass between the cha

A drain system and method for draining a first liquid, including a collection vessel having a first chamber arranged to receive the first liquid, a second chamber, and higher and lower valves positioned between the first and second chambers. When the valves are open, liquids can pass between the chambers. When the pressure in the second chamber exceeds that in the first chamber by more than a first predetermined amount, the valves are closed. A first outlet to the second chamber allows liquids to flow from the second chamber. In a first mode, the first inlet supplies a second liquid at a pressure higher than that of the first liquid in the first chamber such that the valves are closed. In a second mode, the first inlet stops supplying the second liquid such that the pressure in the second chamber reduces relative to the first chamber allowing the valves open.

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1. A drain system for draining a first liquid, the drain system comprising: a collection vessel having a first chamber arranged to receive the first liquid and a second chamber;two valves positioned between the first chamber and the second chamber arranged such that when the drain system is in an up

1. A drain system for draining a first liquid, the drain system comprising: a collection vessel having a first chamber arranged to receive the first liquid and a second chamber;two valves positioned between the first chamber and the second chamber arranged such that when the drain system is in an upright position in which the first chamber is above the second chamber, the valves comprise a higher valve and a lower valve, the valves having an open configuration in which liquids can pass between the chambers and a closed configuration in which the flow of liquids between the chambers is restricted, the valves being arranged to be in the closed configuration when the pressure in the second chamber exceeds that in the first chamber by more than a first predetermined amount; anda first outlet coupled to the second chamber arranged to allow liquids to flow from the second chamber;wherein when the system is in a first operational mode, a first inlet coupled to the second chamber is arranged to supply a second liquid at a pressure higher than that of the first liquid in the first chamber such that the valves are in the closed configuration; andwherein when the system is in a second operational mode, the first inlet is arranged to stop supplying the second liquid such that the pressure in the second chamber reduces relative to the first chamber allowing the valves to return to the open configuration. 2. The drain system of claim 1, wherein each valve comprises a ball check valve arranged such that when the drain system is in the upright position the balls are biased to fall under gravity in the first and the second liquid such that the valves are in the open configuration. 3. The drain system of claim 1, wherein when in the closed configuration, each valve is arranged to permit at least some of the pressurised second liquid to pass from the second chamber to the first chamber. 4. The drain system of claim 1, wherein the first outlet is arranged such that when the drain system is in the upright position, and when the drain system is in the first operational mode, liquids from the bottom portion of the second chamber are expelled through the first outlet. 5. A fuel filter comprising a drain system according to claim 1, wherein the first chamber comprises a sealed chamber having a second inlet and a second outlet, the second inlet and the second outlet being separated within the first chamber by a filter media arranged to allow fuel to pass through and to prevent water from passing through, the fuel filter being arranged such that in use a mixture of fuel and water passes into the first chamber through the second inlet and the filtered fuel passes out of the first chamber through the second outlet, wherein the fuel comprises the second liquid and water comprises the first liquid. 6. A fuel filter according to claim 5, wherein when the drain system is in the upright position and in the second operational mode, and when the fuel is less dense than water, water present in the first chamber is arranged to pass from the first chamber through the lower valve into the second chamber and fuel present in the second chamber is arranged to pass from the second chamber through the higher valve to the first chamber. 7. A fuel supply system comprising a fuel filter according claim 6, and further comprising a pump arranged to receive the filtered fuel from the second outlet, the pump being arranged to pressurise the fuel, the first inlet to the second chamber being coupled to an outlet of the pump such that when in the first operational mode the pump is arranged to supply the pressurised fuel to the first inlet. 8. A fuel supply system according to claim 7, wherein the first outlet from the second chamber is coupled to a control valve such that when in the first operational mode fuel or water present in the second chamber is arranged to be selectively released through the first outlet by control of the control valve, and wherein the control valve is coupled to a collection vessel such that fuel or water from the second chamber is arranged to be received in the collection vessel. 9. A vehicle engine comprising a fuel filter according to claim 5, wherein the first outlet from the second chamber is coupled to a control valve forming part of a hydrocarbon dosing system such that when in the first operational mode fuel or water from the second chamber may be selectively released under pressure by control of the control valve through a nozzle into the exhaust. 10. A vehicle engine according to claim 9, wherein the first operational mode of the drain system corresponds to the engine running such that pressurised fuel is supplied to the second chamber through the first inlet from an engine fuel line, the second operational mode of the drain system corresponding to the engine being switched off such that pressure in the engine fuel line reduces. 11. A vehicle engine according to claim 9, wherein when in the first operational mode a first water sensor is arranged to detect an excess of water in the second chamber and to pass a control signal to an engine control unit which upon receipt of the control signal is arranged to trigger activation of the hydrocarbon dosing system. 12. A vehicle comprising a vehicle engine according to claim 9, wherein when in the first operational mode a second water sensor is arranged to detect an excess of water in the first chamber and to pass a signal to an engine control unit which upon receipt of the control signal is arranged provide a warning signal to the operator of the vehicle indicating that the engine should be switched off. 13. A method of draining a first liquid, the method comprising: receiving the first liquid in a first chamber of a collection vessel, the collection vessel having a second chamber below the first chamber and two valves positioned between the first chamber and the second chamber such that a first valve is higher than a second valve, the valves having an open configuration in which liquids can pass between the chambers and a closed configuration in which the flow of liquids between the chambers is restricted, the valves being arranged to be in the closed configuration when the pressure in the second chamber exceeds that in the first chamber by more than a first predetermined amount;supplying, in a first operational mode, a second liquid under pressure to a first inlet coupled to the second chamber such that the valves are in the closed configuration, the second liquid being less dense than the first liquid;ceasing the supply, in a second operational mode, of the second liquid to the first inlet such that the pressure in the second chamber reduces relative to the first chamber allowing the valves to return to the open configuration such that the first liquid passes from the first chamber to the second chamber through the lower valve, and the second liquid passes from the second chamber to the first chamber through the higher valve; andcontrolling the release of liquids, in the first operational mode, from the second chamber through a first outlet by controlling a control valve coupled to the first outlet. 14. The method of claim 13, wherein the first chamber comprises a sealed chamber having a second inlet and a second outlet, the second inlet and the second outlet being separated within the first chamber by a filter media arranged to allow fuel to pass through and to prevent water from passing through, the method further comprising: supplying a mixture of fuel and water into the first chamber through the second inlet;wherein the filtered fuel passes out of the first chamber through the second outlet, and wherein the fuel comprises the first liquid and water comprises the second fluid. 15. The method of claim 14, wherein the fuel passing out of the first chamber through the second outlet passes to a pump, the method, in the first operational mode further comprising: pressurising the fuel at the pump; andsupplying the pressurised fuel to the first inlet. 16. The method of claim 15, wherein the control valve forms part of a hydrocarbon dosing system in a vehicle engine such that when in the first operational mode the method further comprises: selectively supplying liquids from the second chamber to a nozzle into the exhaust by control of the control valve. 17. The method of claim 16, wherein the first operational mode corresponds to the vehicle engine running such that pressurised fuel is supplied to the second chamber from an engine fuel line, the second operational mode corresponding to the engine being switched off such that pressure in the engine fuel line reduces. 18. The method of claim 16, wherein a first water sensor is arranged to detect whether the amount of water in the second chamber exceeds a predetermined amount such that when in the first operational mode the method further comprises: detecting at the first water sensor an excess of water in the second chamber;passing a control signal from the first water sensor to an engine control unit; andsending a control signal from the engine control unit to the hydrocarbon dosing system to trigger activation of the hydrocarbon dosing system. 19. The method of claim 16, wherein a second water sensor is arranged to detect whether the amount of water in the first chamber exceeds a predetermined amount such that when in the first operational mode the method further comprises: detecting at the second water sensor an excess of water in the first chamber;passing a control signal from the second water sensor to an engine control unit; andsending a warning signal from the engine control unit to the vehicle cabin indicating to the vehicle operator that the engine should be switched off.