No, no, no!!!
A diesel engine injector is controlled by the injection rack which in turn is controlled by the governor to make just enough power to hold the rpm at its set point.
At idle where there is very little load the rack is set to divert 95% of the injection pump stroke to the return line. Even at wot rpm with no load on the engine this is nearly true. Only with load does the rack let more of the stroke go to the injector tip rather than being diverted to the return line.
Only under full load will the injector deliver the full injection pump stroke to the injection tip and therefore into the combustion chamber.
David