I see this thread has a bit of a terminology problem...
Some reason many people on this forum have "shutoff valve" on the injection pump...
Leads to confusing threads like this (or was it just me...)

So just to clarify, the shutoff valve ("vacuum switch") is on the ignition. The governor has the shut off actuator which the shut off valve controls...

So what I'm reading the issue as, is a leak between the shutoff valve and the shutoff actuator on the engine.

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1978 300D, 373,000km 617.912, 711.113 5 speed, 7.5mm superpump, HX30W turbo...many, many years in the making....
1977 280> 300D - 500,000km+ (to be sold...)
1984 240TD>300TD 121,000 miles, *gone*
1977 250 parts car
1988 Toyota Corona 2.0D *gone*
1975 FJ45>HJ45
1981 200>240D (to be sold...)
1999 Hyundai Lantra 1.6 *gone*
1980s Lansing Bagnall FOER 5.2 Forklift (the Mk2 engine hoist)
2001 Holden Rodeo 4JB1T 2WD