Good idea Coaster, thank you.
So yesterday, I pried off the limiting collar on the max fuel screw and backed it out 1 turn. Started it, and it hit 3000 in 1 second, so shut'er down asap.
Backed the screw out 2 turns......it would not run. Turned the screw back in 1/2 turn.....would not run. Put the screw further in, to 1 turn out from Giles setting, and the engine ran, but back up to 3000 in 1 second. Ok......no luck with this attempt.
Next, I drained the fuel from the pump [ on car ]. With a syringe and catheter, I was able to get into the depths of the "fuel in" bore, and into the depths of the "stop solenoid" bore in the pump head. I also loosened the two screws holding the cap on the advance bore......more fuel dribbled from it.
That was as much as I could remove.
Next, I instilled Diesel Purge, full strength into the two bores, until the excess came out the "fuel return" bore. That was as full as I could get the pump, with diesel purge. Now it sits...……
I will see how it runs today. If no luck, I guess I'll try removing the top cover and seeing if I can manually move the control collar on the plunger shaft enough to free it up.
From what I can glean from the vid I watched......in my pump.....the control collar is stuck too far to the delivery end of the plunger, and possible covering up the "cut off slit". So.....it continues to deliver fuel through the plunger to the delivery valves.
Gum on the plunger shaft? The cut off slit filled with gum / goo? A problem with the governor lever assembly...….not pushing the control sleeve to the drive end of the plunger?
Hummmm.