I would look for an air leak into the fuel system causing the fuel pump to send air into the cylinders instead of fuel after sitting for an extended period.
The ether is allowing the engine to start by providing a substitute fuel to get the engine going and by then the fuel pump has pumped the air out of the system through the injectors and is moving diesel to the engine to allow it to continue to run.
It could be a seal in the fuel pump or a leak in the fuel lines very near the engine or even a leak in the small lines that go to the injectors themselves.
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