[quote="Determined"](quoted from post at 14:23:45 11/21/19) Quoting Removed, click Modern View to see
"When the power to the solenoid on the injector pump is removed basically it blocks off the fuel return"
Actually, when power is removed from the shutdown solenoid spring tension rotates the metering valve to the "no fuel" position, stopping the flow of fuel to the pumping plungers.
The other solenoid in the pump cover, the HPCA DOES affect injection timing by lifting the housing pressure regulating valve checkball off of it's seat in the fuel return fitting, decreasing housing pressure to advance timing for cold starts and cleaner burning during warmup.
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