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Christ, some gear driven diesels did have DFCO more or less, although it depends on the pump governor. VE pumps w/ variable-speed governors can do this, but not ones w/ a min-max-speed governor IIRC. That said, most pumps, at least in small cars from the 80s on, have a 12V solenoid/plunger to cut fuel that's only active when the ignition is set to run so even if the pump has a min-max-speed governor someone can setup a separate cut-off for this and have DFCO on demand.
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