I have been working on these BE/CE engines since the late 60s. The reason that you loose prime overnight is: The check/pressure relief ball in the oil pump is not seating properly. If you got a pump rebuild kit or if you just did the work with what you have rebuild, you should always put the ball into the rotor and with a brass punch and heavy hammer, give the ball a good wack, then throw that ball away and assemble the pump with another NEW ball.
I have seen many work with what you have rebuilds that have a small rust spec on the ball and most all the time thins are just fine, then every once in awhile that rust spec get into just the right place to allow it to loos prime.
Another thing to look for is a very fine crack in the threads of the oil screen holder., or mangled threads on either end of the pick-up pipe. Any thing that is not air/oil tight will allow loss of prime.
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