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If you do take it apart all the way at least invest in a $25 rebuild kit with all new rubber parts, you can find them on ebay, etc.

The knurled knob adjusts the amount of droop when load is applied, inward makes it less sensitive/more droop, outward is more sensitive/less droop, but setting too sensitive causes instability.

One note here, any time you are opening up a cover or removing a line from an injection pump you want as close to clean room conditions as possible, one little fleck of paint in the wrong place can clog an injection pump. Ike

I still suspect the rubber parts in the injection pump are breaking down and this problem will not go away until you replace them. Ike

Somewhere in the back of my head I seem to recall the suggested starting position for the knurled knob being 1.5 turns out from fully screwed in, this may be wrong. One other thought, I assume this version of the Stanadyne pump has 2 levers on the outside (one on each side), one is the speed...

There is a flyweight type governor inside the injection pump, your photo looked like there was rust on the fuel cut off shaft from when you had the injection pump top removed, if so the weights on the governor may also have rust on them causing them to stick. Also the knurled knob on the...

I am fairly sure your generator has a Stanadyne / Roosa Master DB series (maybe DC series) injection pump, it should run with fairly minimal inlet fuel pressure (gravity fed), but I am not sure just how minimal, the common symptom of a clogged return line is that it will run for a minute or so...