Don't think you have addressed the cause, only the symptoms. Either under half load, so little fuel is used that all the air leaking into the system went on through without effecting the generator, or there may be another problem requiring the lift pump to increase vacuum which showed symptoms in the form of new air leaks. Do you have a vacuum gauge on the Racor? Symptoms might be from a dirty filter or a partially blocked fuel line. All those vacuum leaks at the same time seem to coincidental to me.
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters