Thank you Steve, and thank you troppo1. Troppo1, don't go to any trouble contorting in the engine
space. Further investigation revealed only the two outboard
(and accessible) banjo connections had the additional aluminum washers. (Someone with my qualifications had been there before me.) The other two, apparently long undisturbed, had only one steel washer each side of the banjo.
Years ago I completely dissembled, freed frozen parts
, reassembled and made work one of these pumps that was left out in the elements somewhere in a Caribbean
boat yard. It worked afterwards. Sheer luck, I guess.
Anyway, if anybody wonders, it turns out it is not difficult, at least with the pump on the bench, to replace the O-rings that seal the two control lever shafts. Mine were shrunk and fossilized. The fuel shut off shaft has one small O-ring, the governor lever two, slightly larger ones. The shafts are held captive in their bores by the long mounting bolts w/ 8mm heads. In my case, the gasket of the little tower was left undisturbed.
The O-rings are in the sealing kit, but it's likely they are standard size and can be purchased for pennies rather than the $40 for the kit.