[Rich Biebel]

Don the fuel pump power circuit on many Onan PC boards has this same problem. I have replaced countless A-1 controllers as that is what Onan calls them.

They routinely run for some time and than shutdown.....and may or may not restart. Diesels as well as gas engine units.

Your solution is fine....but obviously you have to remember to shut off the pump switch.

Sometimes the pin connections are the problem but more often it is internal to the PC board....heat seems to be the problem....The hotter it is out the more likely they are to fail.....