Working on a super dexta now. You mystery line should hook to the fuel shutoff. Dextas didnt have a sediment bowl. They had a shutoff with a primer built in for cold starting.
The small line to the intake squirts diesel onto the heating element in there and the engine then sucks in flaming diesel fuel to help it start.
The shutoff is available for around $120 online. Mine is broke but I'm going to try to repair before I spend $120.
I believe the throttle return spring is in the injector pump. There is a friction washer setup to hold the throttle where you want it, but it should return to idle if its slipping. As a note, mine has the mechanical governed pump and I assume you have the pneumatic, so yours might be different.
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