Since I wrote that I have pulled the tanks and my boat expert and I saw an old level sender unit on top of each tank. He said those are essentially "always" non-working after sitting this much time, but that new senders are quite reasonable, $35 or so. It needs to be 17" for my saddle tanks.
But I will need to either add one gauge and a switch or two gauges on the dash somewhere. This boat apparently never had fuel gauges. There was a piece of round doweling in the boat, and I would bet that is what the fisherman used for their fuel level.
BTW, I dumped both tanks into plastic gas containers and poured about 7 gallons of that stuff into my Durango gas tank (which had 3/4 of good gas). I saw several discussion comments wherein boat experts suggested that because a car's fuel filters are really good, and because the dilution of that much good gas will make that old gas and oil mixture harmless.
I drove the Durango today and noticed nothing different.
Larry
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1975 Wellcraft V20 Steplift with 1979 Evinrude 150. Newly rebuilt dual axle trailer. Boat is in a slip behind Harbor Island on San Diego Harbor.
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