It's cam driven, and as far as I can tell, just moves fuel to the injection pump. There's a little diaphragm seal that failed and allowed fuel to enter the case.Hmmmm,,,,, wonder what this little widget does? Assuming it goes in the bottom of the tank? No electricals? Maybe detects vacuum and stops fuel flow when the engine isn't running? So it's failure caused the injector pump to flood and pour fuel into the the engine block? Trying to brainstorm this....
I walked over to my neighbors and swapped the filter, and checked tube flow (it was OK). Definitely runs a bit better but still blowing heavy exhaust and not clearing up.