On closer examination of the supply lines to the injectors, your model is dead on, each injector had it's own independent line from the pump. There is still one rack-tube which is likely a diesel return, and the other appears to be for pressuring the relief valve that when held open allowed the pistons to move without being under pressure while initially being spun by the compressed air starter. After it began spinning fast enough, those relief valves are closed and the engine allowed to start on combusting diesel. Great textures on the model!!
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