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The fuel adjustment is still the same threaded screw at the front base of the FDC. The FDC is just the top part of the rear injection pump, it sits on top of the pump. All of the internals below the FDC are part of the pump.

Glad it's been fixed. Personally I wouldn't bother hooking the FDC back up, all it does is try to keep the power level the same regardless of what fuel is being used. They also have a bad habit of dumping fuel into the engine oil when they have a leak. By leaving it bypassed the pump is more...

Did you open the fuel tank to check the pump? What is the fuel pressure coming out of the in tank pump? When the engine is first started up, and when it begins to stumble/die.

Air is smaller than fuel. When lines begin to leak it's air intrusion first, no fuel escaping. Happens much more often with soft hoses but after 50+ years copper lines will do it as well. The primary fuel filter is along the chassis and the bolt in question is the long one that secures the...

No reason to keep the FDC, just bypass it. Run the fuel supply hose from the final fuel filter directly to the inlet on the hydraulic head. It's not a needed part for the fuel system. Frothy fuel coming out at the primary filter drain means it still has an air leak between the tank-primary...

It is sucking air so if the fuel pressures are good then it's a cheap (but pain in the ass to locate) problem. Check the seals at all fuel line fittings, including the filter canisters (maybe one didn't seal right when last replaced). Pinhole leaks in the fuel pickup tube would be the next place...