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Já é de moto, já de fabrica

There is no such thing as indefinite energy, there are systems that will run forever, but they are just so efficient that they keep what energy is in the system, putting a pump on the other end of the motor would not work because too much energy would be lost to friction and heat. HOWEVER, you could have a boiler and use a high pressure pump driven by the engine to continue to feed the boiler with fresh water, so as long as the pump has access to a water source, and the boiler is kept hot enough for the water to boil the motor will run.

Hola