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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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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