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Rotary injection pumps are lubricated by fuel. You need to be absolutely sure that shutting off the fuel solenoid doesn't affect lubrication of the pump. Your switch would not be an issue if you were shutting the engine off with it, but if your goal is compression braking, I'd do more research. Spinning a dry rotary injection pump is something you will regret. You might want to talk to a diesel shop that rebuilds Bosch rotary pumps.
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